Question

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
A. I
B. `(I)/(5)`
C. `(I)/(10)`
D. `(2I)/(8)`

Answer 1

Correct Answer - B
`I_(d)=(MR^(2))/(2)`