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A coil having 10 Am^2 magnetic moment is...

A coil having 10 `Am^2` magnetic moment is placed in a vertical plane & is free to rotate about its horizontal axis coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of `90^@` under the influence of magnetic field. The moment of Inertia of coil is 0.1 kg `m^2`. What will be its angular speed?

A

20 `rad//s`

B

10 `rad//s`

C

5 `rad//s`

D

40 `rad//s`

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