array(15) { [0]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "204" ["ques_text"]=> string(4522) "

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

" ["question_id"]=> string(4) "2816" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11149" ["question_id"]=> string(4) "2816" ["opt_desc"]=> string(27) "

0.15 N

" } [1]=> array(3) { ["option_id"]=> string(5) "11150" ["question_id"]=> string(4) "2816" ["opt_desc"]=> string(27) "

0.45 N

" } [2]=> array(3) { ["option_id"]=> string(5) "11151" ["question_id"]=> string(4) "2816" ["opt_desc"]=> string(26) "

0.3 N

" } [3]=> array(3) { ["option_id"]=> string(5) "11152" ["question_id"]=> string(4) "2816" ["opt_desc"]=> string(26) "

0.6 N

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2856" ["question_id"]=> string(4) "2816" ["option_id"]=> string(5) "11151" } } } [1]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "205" ["ques_text"]=> string(239) "

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

" ["question_id"]=> string(4) "2839" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11241" ["question_id"]=> string(4) "2839" ["opt_desc"]=> string(16) "

Zero

" } [1]=> array(3) { ["option_id"]=> string(5) "11242" ["question_id"]=> string(4) "2839" ["opt_desc"]=> string(46) "

10–4 N-m

" } [2]=> array(3) { ["option_id"]=> string(5) "11243" ["question_id"]=> string(4) "2839" ["opt_desc"]=> string(55) "

10–2 N-m

" } [3]=> array(3) { ["option_id"]=> string(5) "11244" ["question_id"]=> string(4) "2839" ["opt_desc"]=> string(35) "

1 N-m

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2879" ["question_id"]=> string(4) "2839" ["option_id"]=> string(5) "11241" } } } [2]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "206" ["ques_text"]=> string(3149) "

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^ as shown in figure. What is the torque

" ["question_id"]=> string(4) "2849" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11281" ["question_id"]=> string(4) "2849" ["opt_desc"]=> string(217) "

+B0NiL2k^

 

" } [1]=> array(3) { ["option_id"]=> string(5) "11282" ["question_id"]=> string(4) "2849" ["opt_desc"]=> string(205) "

−B0NiL2k^

" } [2]=> array(3) { ["option_id"]=> string(5) "11283" ["question_id"]=> string(4) "2849" ["opt_desc"]=> string(199) "

+B0NiL2j^

" } [3]=> array(3) { ["option_id"]=> string(5) "11284" ["question_id"]=> string(4) "2849" ["opt_desc"]=> string(205) "

−B0NiL2j^

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2889" ["question_id"]=> string(4) "2849" ["option_id"]=> string(5) "11282" } } } [3]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "206" ["ques_text"]=> string(245) "

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

" ["question_id"]=> string(4) "2853" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11297" ["question_id"]=> string(4) "2853" ["opt_desc"]=> string(32) "

As large as possible

" } [1]=> array(3) { ["option_id"]=> string(5) "11298" ["question_id"]=> string(4) "2853" ["opt_desc"]=> string(22) "

Any number

" } [2]=> array(3) { ["option_id"]=> string(5) "11299" ["question_id"]=> string(4) "2853" ["opt_desc"]=> string(13) "

2

" } [3]=> array(3) { ["option_id"]=> string(5) "11300" ["question_id"]=> string(4) "2853" ["opt_desc"]=> string(13) "

1

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2893" ["question_id"]=> string(4) "2853" ["option_id"]=> string(5) "11300" } } } [4]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "209" ["ques_text"]=> string(239) "

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

" ["question_id"]=> string(4) "2882" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11413" ["question_id"]=> string(4) "2882" ["opt_desc"]=> string(16) "

Zero

" } [1]=> array(3) { ["option_id"]=> string(5) "11414" ["question_id"]=> string(4) "2882" ["opt_desc"]=> string(46) "

10–4 N-m

" } [2]=> array(3) { ["option_id"]=> string(5) "11415" ["question_id"]=> string(4) "2882" ["opt_desc"]=> string(55) "

10–2 N-m

" } [3]=> array(3) { ["option_id"]=> string(5) "11416" ["question_id"]=> string(4) "2882" ["opt_desc"]=> string(35) "

1 N-m

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2922" ["question_id"]=> string(4) "2882" ["option_id"]=> string(5) "11413" } } } [5]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "209" ["ques_text"]=> string(245) "

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

" ["question_id"]=> string(4) "2883" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11417" ["question_id"]=> string(4) "2883" ["opt_desc"]=> string(32) "

As large as possible

" } [1]=> array(3) { ["option_id"]=> string(5) "11418" ["question_id"]=> string(4) "2883" ["opt_desc"]=> string(22) "

Any number

" } [2]=> array(3) { ["option_id"]=> string(5) "11419" ["question_id"]=> string(4) "2883" ["opt_desc"]=> string(13) "

2

" } [3]=> array(3) { ["option_id"]=> string(5) "11420" ["question_id"]=> string(4) "2883" ["opt_desc"]=> string(13) "

1

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2923" ["question_id"]=> string(4) "2883" ["option_id"]=> string(5) "11420" } } } [6]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "211" ["ques_text"]=> string(4390) "

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

" ["question_id"]=> string(4) "2916" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11549" ["question_id"]=> string(4) "2916" ["opt_desc"]=> string(27) "

0.15 N

" } [1]=> array(3) { ["option_id"]=> string(5) "11550" ["question_id"]=> string(4) "2916" ["opt_desc"]=> string(26) "

0.3 N

" } [2]=> array(3) { ["option_id"]=> string(5) "11551" ["question_id"]=> string(4) "2916" ["opt_desc"]=> string(27) "

0.45 N

" } [3]=> array(3) { ["option_id"]=> string(5) "11552" ["question_id"]=> string(4) "2916" ["opt_desc"]=> string(26) "

0.6 N

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2956" ["question_id"]=> string(4) "2916" ["option_id"]=> string(5) "11550" } } } [7]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "211" ["ques_text"]=> string(3281) "

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^ as shown in figure. What is the torque acting on the coil

" ["question_id"]=> string(4) "2918" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11557" ["question_id"]=> string(4) "2918" ["opt_desc"]=> string(199) "

+B0NiL2k^

" } [1]=> array(3) { ["option_id"]=> string(5) "11558" ["question_id"]=> string(4) "2918" ["opt_desc"]=> string(205) "

−B0NiL2k^

" } [2]=> array(3) { ["option_id"]=> string(5) "11559" ["question_id"]=> string(4) "2918" ["opt_desc"]=> string(199) "

+B0NiL2j^

" } [3]=> array(3) { ["option_id"]=> string(5) "11560" ["question_id"]=> string(4) "2918" ["opt_desc"]=> string(205) "

−B0NiL2j^

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "2958" ["question_id"]=> string(4) "2918" ["option_id"]=> string(5) "11558" } } } [8]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "216" ["ques_text"]=> string(194) "

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

" ["question_id"]=> string(4) "2973" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "11777" ["question_id"]=> string(4) "2973" ["opt_desc"]=> string(103) "

3W

" } [1]=> array(3) { ["option_id"]=> string(5) "11778" ["question_id"]=> string(4) "2973" ["opt_desc"]=> string(109) "

– W

" } [2]=> array(3) { ["option_id"]=> string(5) "11779" ["question_id"]=> string(4) "2973" ["opt_desc"]=> string(128) "

32W

" } [3]=> array(3) { ["option_id"]=> string(5) "11780" ["question_id"]=> string(4) "2973" ["opt_desc"]=> string(23) "

2W

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "3013" ["question_id"]=> string(4) "2973" ["option_id"]=> string(5) "11777" } } } [9]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "221" ["ques_text"]=> string(194) "

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

" ["question_id"]=> string(4) "3037" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "12033" ["question_id"]=> string(4) "3037" ["opt_desc"]=> string(103) "

3W

" } [1]=> array(3) { ["option_id"]=> string(5) "12034" ["question_id"]=> string(4) "3037" ["opt_desc"]=> string(30) "

– W

" } [2]=> array(3) { ["option_id"]=> string(5) "12035" ["question_id"]=> string(4) "3037" ["opt_desc"]=> string(128) "

32W

" } [3]=> array(3) { ["option_id"]=> string(5) "12036" ["question_id"]=> string(4) "3037" ["opt_desc"]=> string(23) "

2W

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "3077" ["question_id"]=> string(4) "3037" ["option_id"]=> string(5) "12033" } } } [10]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "212" ["ques_text"]=> string(203) "

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

" ["question_id"]=> string(4) "3460" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "13725" ["question_id"]=> string(4) "3460" ["opt_desc"]=> string(25) "

(1/4π)Bill

" } [1]=> array(3) { ["option_id"]=> string(5) "13726" ["question_id"]=> string(4) "3460" ["opt_desc"]=> string(36) "

(1/4π)l2iB

" } [2]=> array(3) { ["option_id"]=> string(5) "13727" ["question_id"]=> string(4) "3460" ["opt_desc"]=> string(36) "

(1/4π)B2il

" } [3]=> array(3) { ["option_id"]=> string(5) "13728" ["question_id"]=> string(4) "3460" ["opt_desc"]=> string(36) "

(1/4π)Bi2l

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "3504" ["question_id"]=> string(4) "3460" ["option_id"]=> string(5) "13726" } } } [11]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "295" ["ques_text"]=> string(134) "

For a system to be in equilibrium, the torques acting on it must balance. This is true only if the torques are taken about

" ["question_id"]=> string(4) "4118" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "16354" ["question_id"]=> string(4) "4118" ["opt_desc"]=> string(36) "

The centre of the system

" } [1]=> array(3) { ["option_id"]=> string(5) "16355" ["question_id"]=> string(4) "4118" ["opt_desc"]=> string(44) "

The centre of mass of the system

" } [2]=> array(3) { ["option_id"]=> string(5) "16356" ["question_id"]=> string(4) "4118" ["opt_desc"]=> string(35) "

Any point on the system

" } [3]=> array(3) { ["option_id"]=> string(5) "16357" ["question_id"]=> string(4) "4118" ["opt_desc"]=> string(49) "

Any point on the system or outside it

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "4167" ["question_id"]=> string(4) "4118" ["option_id"]=> string(5) "16357" } } } [12]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "296" ["ques_text"]=> string(270) "

A body rotating at 20 rad/sec is acted upon by a constant torque providing it a deceleration of 2 rad/sec2. At what time will the body have kinetic energy same as the initial value if the torque continues to act

" ["question_id"]=> string(4) "4136" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "16426" ["question_id"]=> string(4) "4136" ["opt_desc"]=> string(28) "

20 secs

" } [1]=> array(3) { ["option_id"]=> string(5) "16427" ["question_id"]=> string(4) "4136" ["opt_desc"]=> string(28) "

40 secs

" } [2]=> array(3) { ["option_id"]=> string(5) "16428" ["question_id"]=> string(4) "4136" ["opt_desc"]=> string(27) "

5 secs

" } [3]=> array(3) { ["option_id"]=> string(5) "16429" ["question_id"]=> string(4) "4136" ["opt_desc"]=> string(28) "

10 secs

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "4185" ["question_id"]=> string(4) "4136" ["option_id"]=> string(5) "16426" } } } [13]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "297" ["ques_text"]=> string(114) "

An engine develops 100 kW, when rotating at 1800 rpm. Torque required to deliver the power is

" ["question_id"]=> string(4) "4146" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "16466" ["question_id"]=> string(4) "4146" ["opt_desc"]=> string(37) "

531 N-m

" } [1]=> array(3) { ["option_id"]=> string(5) "16467" ["question_id"]=> string(4) "4146" ["opt_desc"]=> string(37) "

570 N-m

" } [2]=> array(3) { ["option_id"]=> string(5) "16468" ["question_id"]=> string(4) "4146" ["opt_desc"]=> string(37) "

520 N-m

" } [3]=> array(3) { ["option_id"]=> string(5) "16469" ["question_id"]=> string(4) "4146" ["opt_desc"]=> string(37) "

551 N-m

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "4195" ["question_id"]=> string(4) "4146" ["option_id"]=> string(5) "16466" } } } [14]=> array(3) { ["Question"]=> array(3) { ["test_id"]=> string(3) "297" ["ques_text"]=> string(166) "

A rigid spherical body is spinning around an axis without any external torque. Due to change in temperature, the volume increases by 1%. Its angular speed

" ["question_id"]=> string(4) "4152" } ["Option"]=> array(4) { [0]=> array(3) { ["option_id"]=> string(5) "16490" ["question_id"]=> string(4) "4152" ["opt_desc"]=> string(45) "

Will increase approximately by 1%

" } [1]=> array(3) { ["option_id"]=> string(5) "16491" ["question_id"]=> string(4) "4152" ["opt_desc"]=> string(45) "

Will decrease approximately by 1%

" } [2]=> array(3) { ["option_id"]=> string(5) "16492" ["question_id"]=> string(4) "4152" ["opt_desc"]=> string(48) "

Will decrease approximately by 0.67%

" } [3]=> array(3) { ["option_id"]=> string(5) "16493" ["question_id"]=> string(4) "4152" ["opt_desc"]=> string(48) "

Will decrease approximately by 0.33%

" } } ["Answer"]=> array(1) { [0]=> array(3) { ["answer_id"]=> string(4) "4201" ["question_id"]=> string(4) "4152" ["option_id"]=> string(5) "16492" } } } } torque|Sureden:Your Education Partner

Torque on a dipole

Torque on a Dipole in a Uniform Field: consider an electric dipole consisting of charges +q and –q and of length 2a placed in a unifor
Read More about Torque on a dipole

Torque on a magnetic dipole

Torque on a magnetic dipole in a magnetic field:
Read More about Torque on a magnetic dipole

Torque on current loop in a uniform magnetic field

Torque on current loop in a uniform magnetic field:
Read More about Torque on current loop in a uniform magnetic field

Torque or Moment of Force

Torque or Moment of Force A force can rotate a nut when applied by a wrench or it can open a door while the door rotates in its hinges (i.e.) in ad
Read More about Torque or Moment of Force
Load More...
Test204
cover

Test Details

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

Test205
cover

Test Details

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

Test206
cover

Test Details

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

Test206
cover

Test Details

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

Test209
cover

Test Details

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

Test209
cover

Test Details

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

Test211
cover

Test Details

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

Test211
cover

Test Details

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

Test216
cover

Test Details

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

Test221
cover

Test Details

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

Test212
cover

Test Details

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

Test295
cover

Test Details

For a system to be in equilibrium, the torques acting on it must balance. This is true only if the torques are taken about

Test296
cover

Test Details

A body rotating at 20 rad/sec is acted upon by a constant torque providing it a deceleration of 2 rad/sec2. At what time will the body have kinetic energy same as the initial value if the torque continues to act

Test297
cover

Test Details

An engine develops 100 kW, when rotating at 1800 rpm. Torque required to deliver the power is

Test297
cover

Test Details

A rigid spherical body is spinning around an axis without any external torque. Due to change in temperature, the volume increases by 1%. Its angular speed

Coming Soon...