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Q.

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

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a

2.4N

b

1.2N

c

0.6N

d

0.3N

answer is D.

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Detailed Solution

In magnetic dipole, force  ∝1r4Hence new force =4.824=4.816=0.3 N
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