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Q.

Force between two identical bar magnets whose centres are r metre apart is 4.8N, when their axis are in the same line. If separation is increased to 2r, the force between them is reduced to 

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a

2.4 N

b

1.2 N

c

0.6 N

d

0.3 N

answer is D.

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Detailed Solution

In magnetic dipole, force ∝1r4

Hence, new force =4.824=4.816=0.3 N

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