A short bar magnet is kept in earth’s magnetic field with its north pole pointing earth’s north. The distance between the null points is 20cm. If earth’s horizontal magnetic field is 4×10−5T, then the magnetic moment of the magnet is

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0.4 Am2

4 Am2

40 Am2

0.04 Am2

answer is A.

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Detailed Solution

2d=20cm⇒d=10cmNull points are formed on equatorial line∴BH=μ04π×Md3⇒M=4×10−5×10−310−7=0.4Am2

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