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:

Options

A. `9xx10^(-13)kg m^(2)`
B. `11.25xx10^(-13)kg m^(2)`
C. `5.62xx10^(-13)kg m^(2)`
D. `0.57xx10^(-13)kg m^(2)`

Answer

A

Explanation

`I=(MBT^(2))/(4pi^(2))`