Question

The angular momentum of a moving body remains constant if

(a) net external force is applied

(b) net external torque is applied

(c) net pressure is applied

(d) net external torque is not applied

Answer 1

Correct option (d) net external torque is not applied

Explanation :

When the net external torque acting on a system is zero, the total angular momentum of the system remains constant. Therefore the angular momentum of a moving body remains constant if net external torque is not applied.