SureDen
Magnetic field due to a long straight current carrying conductor: As shown in fig. consider straight conductor XY carrying current I. We wish to find its magn
Magnetic force on a moving charge: the electric charges moving in a magnetic field experiences a force F such that
(i) The force is proportional to
Gauss’s law in magnetism: It states that the surface integral of a magnetic field over a closed surface is always zero.
Classification of magnetic materials:
Diamagnetic substances: Diamagnetic substances ar
Magnetic Properties:
Substance shows magnetic properties because of presence of electrons in them. Each electron in an atom behaves like a magnet because of its two
Ampere’s Circuital law: The line integral of the magnetic field around any closed circuit is equal to the µ0 times the total current l threading or passing through the closed circuit.
Mathematically,
Magnetic dipole:
An arrangement of two equal and opposite magnetic poles separated by a small distance is called a magnetic dipole.
Ever
What is Crystal Field Theory?
Crystal Field Theory (CFT) is a model used to explain the electronic structure of complex metal ions in crystals. It describes how the electrostatic interaction between the metal ion and the surrounding ligand (non-metal) i
Faraday connected a coil to a galvanometer and brought a magnet close to the coil or took it away form the coil. In both the case he observed deflection in the galvanometer.
According to Bohr model of Hydrogen like atoms, negatively charged electron revolves around the positively charged nucleus. This uniform circular motion of the electron is equ
Whenever a large conductor i.e. 2 dimension or 3 dimension conductor in placed in varying magnetic field an EMF is induced in it due to the find closed paths within concentric circular currents known as eddy currents.
Eddy currents by nature are con
Magnetic field of a bar magnet at an axial point:
Cyclotron: It is a device used to accelerate charged particles like protons, deuterons, α particles, etc. to very high energies.
Prin
PRE Board E
Torque on current loop in a uniform magnetic field:
Biot-Savart law: According to Biot-Savart law, the magnitude of the field dB is
Directly proportional to the current I through the conductor. i.
Crushing and Grinding of the ore:- the ores occur in nature as huge lumps. They are broken to small pieces with the help of crushers and grinders. The p
Magnetic lines of force: It may be defined as the curve the tangent to which at any point give the direction of the magnetic field at that point.
Torque on a magnetic dipole in a magnetic field:
Electromagnetic waves
It is a disturbance which carries energy in space due to the simultaneously time varying mutually perpendicular electric and
Current loop as a magnetic dipole:
We know that the magnetic field produced at a larger distance r from the centre of a circular loop along its axi
General Physiochemical Properties:-
The general physiochemical properties of 1st row transition elements are discussed as follows:
Hysteresis: The phenomenon of lagging of magnetic induction behind the magnetizing field is called Hysteresis and called “delayed”.
Dimensions of a Physical Quantity.
The powers to which fundamental quantities must be raised in order to express the given physical quantity are called its dimensions.
To make it more clear, consider the physical quantity force
Magnet:- Those materials which have attractive and directive properties.
Two types of magnet:
Natural magnet: Which occur naturall
Coulomb’s law or magnetic force:
It state that the force of attraction or repulsion between two magnetic poles is directly proportional to th
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Current flows due north in a horizontal transmission line. Magnetic field at a point P vertically above it directed
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Magnetic field due to a current carrying loop or a coil at a distant axial point P is B1 and at an equal distance in it's plane is B2 then B1/B2 is
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A long solenoid has 200 turns per cm and carries a current of 2.5 A. The magnetic field at its centre is
[m0 = 4p ´ 10–7 Wb/m2]
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A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately (µ0/4Π=10-7 Tesla-metre/ampere)
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Two solenoids having lengths L and 2L and the number of loops N and 4N, both have the same current, then the ratio of the magnetic field will be
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Electrons move at right angles to a magnetic field of Tesla with a speed of 6 X 1027 m/s. If the specific charge of the electron is 1.7 x 1011 Coul/kg. The radius of the circular path will be &n
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An electron (mass =9x10-31kg. charge =1.6 x 10-19coul.) whose kinetic energy is 7.2 x 10-18jule is moving in a circular orbit in a magnetic field of 9x10-5weber/m2. The radius of the orbit is
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An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true
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A proton of mass m and charge is moving in a circular orbit of a magnetic field with energy 1MeV. What should be the energy of a-particle (mass = 4 m and charge = +2e), so that it can revolve in the path of same radius
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A proton and an particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 µsec to make 5 revolutions, then the periodic time for the particle would be
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A particle with 10–11 coulomb of charge and 10–7 kg mass is moving with a velocity of 108 m/s along the y-axis. A uniform static magnetic field B = 0.5 Tesla is acting along the x-direct
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Find the position of point from wire 'B' where net magnetic field is zero due to following current distribution
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Find out the magnitude of the magnetic field at point P due to following current distribution
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What will be the resultant magnetic field at origin due to four infinite length wires. If each wire produces magnetic field 'B' at origin
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Two parallel, long wires carry currents i1 and i1 with i1>i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10 mT. If the direction of i1 is reversed, the field becomes 3
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A wire of fixed length is turned to form a coil of one turn. It is again turned to form a coil of three turns. If in both cases same amount of current is passed, then the ratio of the intensities of magnetic field produced at the centre of a coil will be
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The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be
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Two infinite length wires carries currents 8A and 6A respectively and placed along X and Y-axis. Magnetic field at a point P (0,
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An equilateral triangle of side 'a' carries a current i then find out the magnetic field at point P which is vertex of triangle
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A particle carrying a charge equal to 100 times the charge on an electron is rotating per second in a circular path of radius 0.8 metre. The value of the magnetic field produced at the centre will be (μ
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Ratio of magnetic field at the centre of a current carrying coil of radius R and at a distance of 3R on its axis is
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A circular coil of radius 4 cm has 50 turns. In this coil a current of 2 A is flowing. It is placed in a magnetic field of 0.1 weber/m2. The amount of work done in rotating it through 180o from its equilibrium position will be
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Find magnetic field at centre O in each of each of the following figure
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When a charged particle circulates in a normal magnetic field, then the area of it's circulation is proportional to
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Electrons move at right angles to a magnetic field of 1.5 x 10-2Tesla with a speed of 6 x 1027m/s. If the specific charge of the electron is 1.7 x 1011 Coul/kg. The radius of the circular path will be
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The average radius of a toroid made on a ring of non-magnetic material is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the magnetic field produced along its circular axis inside the toroid will be
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An electron (mass =9 x 10-31kg charge =1.6 x 10-19coul.) whose kinetic energy is 7.2 x 10-18 joule is moving in a circular orbit in a magnetic field of 9 x 10-5 weber/m2 The radius of the orbit is
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For the solenoid shown in figure. The magnetic field at point P is
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An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true
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A coil of 50 turns is situated in a magnetic field b = 0.25weber/m2 as shown in figure. A current of 2A is flowing in the coil. Torque acting on the coil will be
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Find out the magnitude of the magnetic field at point P due to following current distribution
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A proton and an ∝- particles enters in a uniform magnetic field with same velocity, then ratio of the radii of path describe by them
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A proton of mass m and charge +e is moving in a circular orbit of a magnetic field with energy 1MeV. What should be the energy of a-particle (mass = 4 m and charge = +2e), so that it can revolve in the path of same radius
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A proton and an ∝-particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 µ sec to make 5 revolutions, then the periodic time for the ∝-particle would be
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The coil of a galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is 10– 8 N-m rad. The magnetic field between the pole pieces is 5 T. The current sensitivity of this galvanometer will be
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A particle with 10–11 coulomb of charge and 10–7 kg mass is moving with a velocity of 108 m/s along the y-axis. A uniform static magnetic field B = 0.5 Tesla is acting along the x-direct
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A particle of charge -16 x 10-18 coulomb moving with velocity 10 m/s along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 104 V/m is along the negative
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A wire of length l carries a current i along the X-axis. A magnetic field exists which is given as B→=B0 (
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A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction extending from x = a to x = b.
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At a certain place magnetic field vertically downwards. An electron approaches horizontally towards you and enters in this magnetic fields. It's trajectory, when seen from above will be a circle which is
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When a charged particle circulates in a normal magnetic field, then the area of it's circulation is proportional to
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An electron moves straight inside a charged parallel plate capacitor at uniform charge density σ.The space between the plates is filled with constant magnetic field of induction B→.Tim
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A proton of mass 1.67 x 10-27kg and charge 1.6 x 10-19C is projected with a speed of 2 x 106 at an angle of 600 to the X-axis. If a uniform magnetic field of 0.104 Tesla is applied along Y-axis, the
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A charge particle, having charge q accelerated through a potential difference V enter a perpendicular magnetic field in which it experiences a force F. If V is increased to 5V, the particle will experience a force
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The magnetic field is downward perpendicular to the plane of the paper and a few charged particles are projected in it. Which of the following is true
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3 A of current is flowing in a linear conductor having a length of 40 cm. The conductor is placed in a magnetic field of strength 500 gauss and makes an angle of 30o with the direction of the field. It experiences a force of magnitude
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Wires 1 and 2 carrying currents f1 and f2 respectively are inclined at an angle θ to each other. What is the force on a small element dl of wire 2 at a distance of r from 1 (as shown in figure) due to the magnetic field of wire 1
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A circular loop of radius a, carrying a current i, is placed in a two-dimensional magnetic field. The centre of the loop coincides with the centre of the field. The strength of the magnetic field at the periphery of the loop is B. Find the magnetic force on the wire
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A circular coil of radius 4 cm and 20 turns carries a current of 3 ampere. It is placed in a magnetic field of 0.5 T. The magnetic dipole moment of the coil is
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A circular loop of area 1 cm2, carrying a current of 10 A, is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is
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A conductor in the form of a right angle ABC with AB = 3cm and BC = 4 cm carries a current of 10 A. There is a uniform magnetic field of 5T perpendicular to the plane of the conductor. The force on the conductor will be
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A conducting loop carrying a current i is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to
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Current i flows through a long conducting wire bent at right angle as shown in figure. The magnetic field at a point P on the right bisector of the angle XOY at a distance r from O is
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A square coil of N turns (with length of each side equal L) carrying current i is placed in a uniform magnetic field B→=B0j
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Two very long straight, particle wires carry steady currents i and – i respectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from the two wires, in the plane of the wires. It's i
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A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards north. The wire will experience a force directed towards
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A wire of length L is bent in the form of a circular coil and current i is passed through it. If this coil is placed in a magnetic field then the torque acting on the coil will be maximum when the number of turns is
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A wire abc is carrying current i. It is bent as shown in fig and is placed in a uniform magnetic field of magnetic induction B. Length ab = l and ∠abc = 45o
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The average radius of a toroid made on a ring of non-magnetic material is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the magnetic field produced along its circular axis inside the toroid will be
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A circular loop of radius a, carrying a current i, is placed in a two-dimensional magnetic field. The centre of the loop coincides with the centre of the field. The strength of the magnetic field at the periphery of the loop is B. Find the magnetic force on the wire
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Find out the magnitude of the magnetic field at point P due to following current distribution
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For the solenoid shown in figure. The magnetic field at point P is
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Two parallel, long wires carry currents i1 and i1 with i1>i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10 mT. If the direction of i1 is reversed, the field becomes 3
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A circular coil of radius 4 cm and 20 turns carries a current of 3 ampere. It is placed in a magnetic field of 0.5 T. The magnetic dipole moment of the coil is
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Two infinite length wires carries currents 8A and 6A respectively and placed along X and Y-axis. Magnetic field at a point P (0,
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A circular loop of area 1 cm2, carrying a current of 10 A, is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is
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A wire of length L is bent in the form of a circular coil and current i is passed through it. If this coil is placed in a magnetic field then the torque acting on the coil will be maximum when the number of turns is
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A particle carrying a charge equal to 100 times the charge on an electron is rotating per second in a circular path of radius 0.8 metre. The value of the magnetic field produced at the centre will be (μ
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A circular coil of radius 4 cm has 50 turns. In this coil a current of 2 A is flowing. It is placed in a magnetic field of 0.1 weber/m2. The amount of work done in rotating it through 180o from its equilibrium position will be
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Ratio of magnetic field at the centre of a current carrying coil of radius R and at a distance of 3R on its axis is
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The coil of a galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is 10– 8 N-m rad. The magnetic field between the pole pieces is 5 T. The current sensitivity of this galvanometer will be
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The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be
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A wire of length l carries a current i along the X-axis. A magnetic field exists which is given as B→=B0 (
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A wire of fixed length is turned to form a coil of one turn. It is again turned to form a coil of three turns. If in both cases same amount of current is passed, then the ratio of the intensities of magnetic field produced at the centre of a coil will be
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What will be the resultant magnetic field at origin due to four infinite length wires. If each wire produces magnetic field 'B' at origin
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A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards north. The wire will experience a force directed towards
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3 A of current is flowing in a linear conductor having a length of 40 cm. The conductor is placed in a magnetic field of strength 500 gauss and makes an angle of 30o with the direction of the field. It experiences a force of magnitude
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A charge particle, having charge q accelerated through a potential difference V enter a perpendicular magnetic field in which it experiences a force F. If V is increased to 5V, the particle will experience a force
Test Details
When a charged particle circulates in a normal magnetic field, then the area of it's circulation is proportional to
Test Details
At a certain place magnetic field vertically downwards. An electron approaches horizontally towards you and enters in this magnetic fields. It's trajectory, when seen from above will be a circle which is
Test Details
A particle of charge -16 x 10-18 coulomb moving with velocity 10 m/s along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 104 V/m is along the negative
Test Details
A particle with 10–11 coulomb of charge and 10–7 kg mass is moving with a velocity of 108 m/s along the y-axis. A uniform static magnetic field B = 0.5 Tesla is acting along the x-direct
Test Details
A proton and an ∝-particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 µ sec to make 5 revolutions, then the periodic time for the ∝-particle would be [MP
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A proton of mass m and charge +e is moving in a circular orbit of a magnetic field with energy 1MeV. What should be the energy of a-particle (mass = 4 m and charge = +2e), so that it can revolve in the path of same radius
Test Details
A proton and an ∝- particles enters in a uniform magnetic field with same velocity, then ratio of the radii of path describe by them
Test Details
An electron (mass =9 x 10-31kg charge =1.6 x 10-19coul.) whose kinetic energy is 7.2 x 10-18 joule is moving in a circular orbit in a magnetic field of 9 x 10-5 weber/m2 The radius of the orbit is
Test Details
Find the position of point from wire 'B' where net magnetic field is zero due to following current distribution
Test Details
The magnetic field is downward perpendicular to the plane of the paper and a few charged particles are projected in it. Which of the following is true
Test Details
An electron moves straight inside a charged parallel plate capacitor at uniform charge density σ. The space between the plates is filled with constant magnetic field of induction B→.
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Wires 1 and 2 carrying currents f1 and f2 respectively are inclined at an angle θ to each other. What is the force on a small element dl of wire 2 at a distance of r from 1 (as shown in figure) due to the magnetic field of wire 1
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A wire abc is carrying current i. It is bent as shown in fig and is placed in a uniform magnetic field of magnetic induction B. Length ab = l and Ð abc = 45o. The ratio of force on ab and on bc is
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An equilateral triangle of side 'a' carries a current i then find out the magnetic field at point P which is vertex of triangle
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Figure shows a square loop ABCD with edge length a. The resistance of the wire ABC is r and that of ADC is 2r.
The value of magnetic field at the centre of the loop assuming uniform wire is
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A coil of 50 turns is situated in a magnetic field b = 0.25weber/m2 as shown in figure. A current of 2A is flowing in the coil. Torque acting on the coil will be
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Find magnetic field at centre O in each of each of the following figure
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A square coil of N turns (with length of each side equal L) carrying current i is placed in a uniform magnetic field B→=B0j
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Current i flows through a long conducting wire bent at right angle as shown in figure. The magnetic field at a point P on the right bisector of the angle XOY at a distance r from O is
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A proton of mass 1.67 x 10-27kg and charge 1.6 x 10-19C is projected with a speed of 2 x 106 at an angle of 600 to the X-axis. If a uniform magnetic field of 0.104 Tesla is applied along Y-axis, the
Test Details
An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true
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A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction extending from x = a to x = b.
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Two very long straight, particle wires carry steady currents i and – i respectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from the two wires, in the plane of the wires. It's i
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A conductor in the form of a right angle ABC with AB = 3cm and BC = 4 cm carries a current of 10 A. There is a uniform magnetic field of 5T perpendicular to the plane of the conductor. The force on the conductor will be
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A conducting loop carrying a current i is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to
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Electrons move at right angles to a magnetic field of 1.5 x 10-2Tesla with a speed of 6 x 1027m/s. If the specific charge of the electron is 1.7 x 1011 Coul/kg. The radius of the circular path will be &nbs
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Two identical magnetic dipoles of magnetic moments 1.0 A-m2 each, placed at a separation of 2m with their axis perpendicular to each other. The resultant magnetic field at a point midway between the dipoles is
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The magnetic field at a point X on the axis of a small bar magnet is equal to the field at a point Y on the equator of the same magnet. The ratio of the distance of X and Y from the centre of the magnet is
[MP PMT 1990]
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The distance between the poles of a horse shoe magnet is 0.1 m and its pole strength is 0.01 amp-m. The induction of magnetic field at a point midway between the poles will be
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A bar magnet with it's poles 25 cm apart and of pole strength 24 amp×m rests with it's centre on a frictionless pivot. A force F is applied on the magnet at a distance of 12 cm from the pivot so that it is held in equilibrium at
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Earth's magnetic field may be supposed to be due to a small bar magnet located at the centre of the earth. If the magnetic field at a point on the magnetic equator is 0.3×10–4 T. Magnet moment of bar magnet is
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Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field. With like poles together 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments
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A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30o and 15 oscillations per minute at a place where dip angle is 60o. The ratio of total earth's magnetic field at the two
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A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 40 oscillations per minute at a place B. If the horizontal component of earth's magnetic field at A is 36 x 10-6 T, then its value at B is
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A magnet makes 40 oscillations per minute at a place having magnetic field intensity BH=0.1 x 10-5. At another place, it takes 2.5 sec to complete one-vibration. The value of earth's horizontal field at that place
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In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is 2 sec. When a magnet is brought near and parallel to it, the time period reduces to 1 sec. The ratio H/F of the horizontal component H an
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The magnetic needle of a tangent galvanometer is deflected at an angle 30° due to a magnet. The horizontal component of earth's magnetic field 0.34 x 10–4 T is along the plane of the coil. The magnetic intensity is
[KCET 1999; AFMC 1999, 200
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At a place the earth's horizontal component of magnetic field is 0.38 x 10-4weber/m2. If the angle of dip at that place is 60°, then the vertical component of earth's field at that place in weber/m2 will be approximately
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A bar magnet has a magnetic moment of 2.5JT-1 and is placed in a magnetic field of 0.2T. Work done in turning the magnet from parallel to anti-parallel position relative to field direction is
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A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30° in C.G.S. units is
[MP PET 1991]
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If the angles of dip at two places are 30° and 45° respectively, Then the ratio of horizontal components of earth's magnetic field at the two places will be
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A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. It the magnet is rotated by 90° in the horizontal plane, the net magnetic induction at P is : (Horizontal component of earth's magnetic field = BH
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A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque required to maintain the needle in this position will be
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At a place the earth's horizontal component of magnetic field is 0.38 x 10-4weber/m2. If the angle of dip at that place is 60°, then the vertical component of earth's field at that place in weber/m2 will be approximately
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A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 40 oscillations per minute at a place B. If the horizontal component of earth's magnetic field at A is 36 x 10-6 T, then its value at B is
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In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is 2 sec. When a magnet is brought near and parallel to it, the time period reduces to 1 sec. The ratio H/F of the horizontal component H an
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Earth's magnetic field may be supposed to be due to a small bar magnet located at the centre of the earth. If the magnetic field at a point on the magnetic equator is 0.3×10–4 T. Magnet moment of bar magnet is
Test Details
Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field. With like poles together 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments
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The magnetic needle of a tangent galvanometer is deflected at an angle 30° due to a magnet. The horizontal component of earth's magnetic field 0.34 x 10–4 T is along the plane of the coil. The magnetic intensity is
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A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30o and 15 oscillations per minute at a place where dip angle is 60o. The ratio of total earth's magnetic field at t
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A magnet makes 40 oscillations per minute at a place having magnetic field intensity BH=0.1 x 10-5. At another place, it takes 2.5 sec to complete one-vibration. The value of earth's horizontal field at that place
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If the angles of dip at two places are 30° and 45° respectively, Then the ratio of horizontal components of earth's magnetic field at the two places will be
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A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30° in C.G.S. units is
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A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. It the magnet is rotated by 90° in the horizontal plane, the net magnetic induction at P is : (Horizontal component of earth's magnetic field = BH
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A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque required to maintain the needle in this position will be
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The distance between the poles of a horse shoe magnet is 0.1 m and its pole strength is 0.01 amp-m. The induction of magnetic field at a point midway between the poles will be
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A bar magnet with it's poles 25 cm apart and of pole strength 24 amp×m rests with it's centre on a frictionless pivot. A force F is applied on the magnet at a distance of 12 cm from the pivot so that it is held in equilibrium at
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A bar magnet has a magnetic moment of 2.5JT-1 and is placed in a magnetic field of 0.2T. Work done in turning the magnet from parallel to anti-parallel position relative to field direction is
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The magnetic field at a point X on the axis of a small bar magnet is equal to the field at a point Y on the equator of the same magnet. The ratio of the distance of X and Y from the centre of the magnet is
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Two identical magnetic dipoles of magnetic moments 1.0 A-m2 each, placed at a separation of 2m with their axis perpendicular to each other. The resultant magnetic field at a point midway between the dipoles is
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A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is
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A long straight wire carrying current of 30 A is placed in an external uniform magnetic field of induction 4 x 10-4 T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction (in tesla) at a point 2.0 cm away from the wire
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A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
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If a long hollow copper pipe carries a current, the produced magnetic field will be
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Two ions having masses in the ratio 1:1 and charges 1:2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2:3. The ratio of the radii of circular paths along which the two particles move is
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A charge particle is at rest in the region where magnetic field and electric field are parallel. The particle will move in a
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An electron and proton have equal kinetic energies. They enter in a magnetic field perpendicularly then
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When a charged particle enters a uniform magnetic field, its kinetic energy
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The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 µT. What will be its value at the centre of the loop?
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Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of magnetic field due to one coil to the resultant magnetic field by both coils, if the same current is flown.
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A long solenoid has 200 turns per cm and carries a current of 2.5 ampere. The magnetic field at its centre is [µ0=4π x 10-7 weber/m2]
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A current of ¼π A is flowing through a toroid. It has 1000 number of turns per metre then value of magnetic field (in Wb/m2) along its axis is
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A wire of length l is formed into a circular loop of one turn only and is suspended in a magnetic field B. When a current i is passed through the loop, the maximum torque experienced by it is
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Current flows due north in a horizontal transmission line. Magnetic field at a point P vertically above it directed
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Magnetic field due to a current carrying loop or a coil at a distant axial point P is B1 and at an equal distance in it's plane is B2 then B1B
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What will be the resultant magnetic field at origin due to four infinite length wires. If each wire produces magnetic field 'B' at origin
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A wire of fixed length is turned to form a coil of one turn. It is again turned to form a coil of three turns. If in both cases same amount of current is passed, then the ratio of the intensities of magnetic field produced at the centre of a coil will be &nb
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Two infinite length wires carries currents 8A and 6A respectively and placed along X and Y-axis. Magnetic field at a point P (0,
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A long solenoid has 200 turns per cm and carries a current of 2.5 A. The magnetic field at its centre is [m0 = 4p ´ 10–7 Wb/m2]
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A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately (μ0
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For the solenoid shown in figure. The magnetic field at point P is
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The average radius of a toroid made on a ring of non-magnetic material is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the magnetic field produced along its circular axis inside the toroid will be
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Two solenoids having lengths L and 2L and the number of loops N and 4N, both have the same current, then the ratio of the magnetic field will be
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Electrons move at right angles to a magnetic field of 1.5×10−2Tesla with a speed of
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An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true
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A proton and an α−particles enters in a uniform magnetic field with same velocity, then ratio of the radii of path describe by them
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A proton and an α−particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25μ
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A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction extending from x = a to x = b.
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At a certain place magnetic field vertically downwards. An electron approaches horizontally towards you and enters in this magnetic fields. It's trajectory, when seen from above will be a circle which is
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When a charged particle circulates in a normal magnetic field, then the area of it's circulation is proportional to
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A charge particle, having charge q accelerated through a potential difference V enter a perpendicular magnetic field in which it experiences a force F. If V is increased to 5V, the particle will experience a force
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In Bainbridge mass spectrograph a potential difference of 1000 V is applied between two plates distant 1 cm apart and magnetic field in B = 1T. The velocity of undeflected positive ions in m/s from the velocity selector is
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