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Question

Two magnetic poles of strengths 40 Am and 10 Am are separated by a distance of 20 cm in air. The force between them if the distance is reduced to 10 cm is

A
4×103N,103N
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B
103N,4×103N
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C
2×103N,103N
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D
103N,2×103N
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Solution

The correct option is B 103N,4×103N
m1=40 Am,m2=10 Am,d1=20 cm
d2=10cm
F=μm1m24πd2
F1=107×40×10(20×102)2
=103
Force is inversely proportional to d2
F2=4×103

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