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A thin circular ring and a circular disc...

A thin circular ring and a circular disc have equal masses but different radii equal to `R_1 and R_2`. If their moments of inertia about their own diameters are equal, their radii will be in

A

`1 : 1`

B

`1 : sqrt2`

C

`sqrt2 : 1`

D

`1: 2`

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The correct Answer is:
B
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