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A bar magnet has a magnetic moment equal...

A bar magnet has a magnetic moment equal to `65xx10^(-5)` wever `x` metre. It is suspended in a magnetic field which has a magnetic induction `(B)` equal to `8pixx10^(-4)` tesla. The magnet vibrates with a period of vibration equal to `15`seconds. The moment of inertia of the magnet is:

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