Q.

Two poles separated by 10 cm experiences a force of 5 mN. Find  the force between them when the distance is doubled and the pole strengths are doubled

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a

5 mN

b

10 mN

c

2.5 mN

d

1 mN

answer is A.

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Detailed Solution

Fαm2d2⇒FfFi=4m24d2/m2d2=1
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