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Offline Centres

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

2.4 N

b

0.6 N

c

1.2 N

d

0.3 N

answer is D.

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Detailed Solution

F1F⇒rr14 ; 4.8F1=2rr4, F1=0.3 N

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