Coulomb’s law or magnetic force:

It state that the force of attraction or repulsion between two magnetic poles is directly proportional to the product of this pole strengths and inversely proportional to the square of the distance between them which is given by

Then   

If m₁  &  m₂ = 1 unit, r =1m, then   

Hence a unit magnetic pole when placed in vacuum at a distance of one meter from identical pole repel it with a force of 10^-7 N.