Q. A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere ?
A) Rotational kinetic energy
B) Moment of inertia
C) Angular velocity
D) Angular momentum
Explanation
[Solution] No external torque acts, so angular momentum is conserved. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.