Solve the following :


Find the radius of gyration of a circular ring of radius $r$ about a line perpendicular to the plane of the ring passing through one of its particles.


.$I_{a x i s}=I_{C O M}+m x^{2}$

$I_{A A^{r}}=m r^{2}+m r^{2}$

$I_{A A^{r}}=2 m r^{2}$

$\mathrm{~m}^{k^{2}}=2 m r^{2}$

$\therefore \mathrm{k}=\sqrt{2} r$

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