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The moment of inertia of a solid sphere ...

The moment of inertia of a solid sphere of radius R about an axis passing through its diameter is I. The sphere is melted and recast into a circular disc of thickness `frac{R}{3}`. The moment of inertia of this disc about an axis perpendicular to plane and passing through its centre of mass is

A

5 I

B

3.5 I

C

4 I

D

2.5 I

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