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Physics

# 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 :

$\begin {array} {1 1} (1)\;\sqrt 2 : \sqrt 3 & \quad (2)\;\sqrt 3 : \sqrt 2 \\ (3)\;1 : \sqrt 2 & \quad (4)\;\sqrt 2 : 1 \end {array}$

Can you answer this question?