Two magnetic poles of strengths 10 Am and 20 Am are separated by a distance of 10 cm. The ratio of force on them is
2 : 1
1 : 4
1 : 1
1: 2
A
1: 2
B
1 : 1
C
2 : 1
D
1 : 4
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Solution
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Force on each one of them is due to another one. So, they will be same. F12=(μ0m14πd2)m2
F21=(μ0m24πd2)m1 F12=F21
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