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A solid sphere of mass M and radius R having tmoment of inertia I about its diameter is recast into a solid dise of radius r and thickness t. The moment of inertia of the disc about an axis passing the edge and perpendicular to the plane remains I. Then R and r are related as

A

`r=sqrt((2)/(15))R`

B

`r=(2)/(sqrt15)R`

C

`r=2/15R`

D

`r=sqrt2/15R`

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The correct Answer is:
B
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