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A solid sphere of mass M, radius R and h...

A solid sphere of mass `M`, radius `R` and having moment of inertia about as axis passing through the centre of mass as `I`, is recast into a disc of thickness `t`, whose moment of inertia about an axis passing through its edge and perpendicular to its plance remains `I`. Then, radius of the disc will be.

A

`2R //sqrt(15)`

B

`R sqrt(2//15)`

C

`4R//sqrt(15)`

D

`R//4`

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The correct Answer is:
A
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