A rigid body is rotating about a vertical axis at n rotations per minute, If the axis slowly becomes horizontal in t seconds and the body keeps on rotating at n rotations per minute then the torque acting on the body will be, if the moment of inertia of the body about axis of rotation is I.

Options

A. zero
B. `(2pi nI)/(60t)`
C. `(2sqrt(2)pi nI)/(60t)`
D. `(4pi n I)/(60t)`

Answer

C