Q. The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is
A) √2 : √3
B) √3 : √2
C) 1 : √2
D) √2 : 1
Explanation
[Solution from source] About the central axis, I(disc) = MR²/2 gives k = R/√2, and I(ring) = MR² gives k = R. So k(disc) : k(ring) = 1 : √2. √2 : 1 is the inverted ratio (ring to disc). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.