A disc of radius R and thickness R/6 has...

A disc of radius R and thickness `R/6` has a moment of inertia I about an axis passing through its centre and perpendicular to its plane. The disc is melted and recast into a solid sphere. The moment of inertia of a sphere about its diameter is

`I`

`2I"/"3`

`I"/"5`

`I"/"10`

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