Question

The force between two short bar magnets with magnetic
moments M₁ and M₂ whose centres are r metres apart is 8 N
when their axes are in same line. if the separation is increased
to 2 r, the force between them in reduced to
(a) 4 N (b) 2 N (c) 1 N (d) 0.5 N

Answer 1

Answer:

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