A circular disc of radius R and thicknes...

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

`(2I)/(8)`

`I/5`

`I/(10)`

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