A closed current-carrying loop having a current I is having area A. Magnetic moment of this loop is defined as `vec(mu) = vec(IA)` where direction of area vector is towards the observer if current is flowing in anticlockwise direction with respect to the observer. If this loop is placed in a uniform magnetic field `vec(B)`, then torque acting on the loop is given by `vec(tau) = vec(mu) xx vec(B)`. Now answer the following questions:
A uniformly charged insulating ring is rotated in a uniform magnetic field about its own axis, then

Options

A. Ring will experience a magnetic force
B. Ring must be experience a magnetic torque
C. Ring may experience a magnetic torque
D. None of the above

Answer

C

Explanation

`tau=MB sin theta`, Rotating ring will behave as a magnetic pole.