Two magnetic poles one of which is 4 times as strong as the other exert a force of 64 mgwt when place 10 cm apart in air. Strength of pole are

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3Am, 12 Am

4 Am, 16 Am

5 Am, 20 Am

6 Am, 10 Am

answer is B.

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Detailed Solution

m2=4m1 F=64×10−3×10−3×10F=64×10−5N∴F=μ4π×4m12r2⇒m1=4Am ; m2=16Am

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