The magnetic induction field strength due to a short bar magnet at a distance 0.20 m on the equatorial line is 20x10−6 tesla. The magnetic moment of the bar magnet is
3.2A.m2
6.4A.m2
1.6A.m2
16A.m2
A
1.6A.m2
B
3.2A.m2
C
6.4A.m2
D
16A.m2
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Solution
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Magnetic field at the equator is, B(equatorial) =−μ0m4πd3 20×156=2×4π×10−7×m4π×(0.2)3 m=1.6Am.
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