Moment of inertia of the ring about an axis through its Centre is l= MR². What is the radius of gyration about the same axis.
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By, Parallel axis theorm
I at 2R is 2MR
2
/5+M(2R)
2
=22MR
2
/5
Radius of gyration, Mk
2
=22MR
2
/5⇒k=
22/5
- ×R
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