Rotation

Rotating Bar : Induced EMF|| Torque on a Rotating bar || Examples on rotating bar in magnetic field

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.

If the reflected ray is rotated by an angle of 4theta in clockwisse direction then the mirror was rotated by