A bar magnet has a magnetic moment equal to 5 x 10-5Wb m. It is suspended in a magnetic field which has a magnetic induction (B) equal to 8π x 10-4 tesla. The magnet vibrates with a period of vibration equal to 15 s.The moment of inertia of the magnet is
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a
22.5 x 10-7 kg m2
b
11.25 x 10-7 kg m2
c
5.62 x 10-7 kg m2
d
7.16 x 10-7 kg m2
answer is D.
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Detailed Solution
Time period of a magnet, T=2πIMBor I=T2MB4π2=225 x 5 x 10-5 x 8π x 10-44π2∴I=7.16 x 10-7 kg m2