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A bar magnet has a magnetic moment equal...

A bar magnet has a magnetic moment equal to `5 xx 10^-5 W-m`.It is suspended in a magnetic field, which has a magnetic induction equal to `8pi xx 10^-4 tesla`. The magnet vibrates with a time period of vibration equal to 15 s.The moment of inertia of the bar magnet is

A

`2.5 xx 10^-7 kg-m^2`

B

`4.25 xx 10^-7 kg-m^2`

C

`5.62 xx 10^-7 kg-m^2`

D

`7.16 xx 10^-7 kg-m^2`

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