Q. If the external torque acting on a system $\overrightarrow{\tau} = 0$, then
A) $\omega = 0$
B) $\alpha = 0$
C) $J = 0$
D) $F = 0$
Explanation
(b) $\tau = I\alpha$, if $\tau = 0$ then $\alpha = 0$ because moment of inertia of any body cannot be zero
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.