Q. If the torque is zero, what will be the value of angular momentum?
A) Constant in magnitude but changing is direction
B) Changing in magnitude but constant in direction
C) Constant on both magnitude and direction
D) Zero
Explanation
(c) From law of conservation of angular momentum we have, if no external torque is acting on a body ($\tau = 0$), then the angula momentum $(J = I\omega)$ or in other words the moment of momentum of a body remains constant.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.