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 :
Answer & explanation
Correct answer: option 3
\(\frac{I_{disc}}{I_{ring}} = \frac{MR^2/ 2}{MR^2} = \frac{Mk_{disc}^2}{Mk_{ring}^2} \)
\(\frac{k_{disc}}{k_{ring}} = \frac{1}{\sqrt{2}}\)