A solid sphere of mass M, radius R and having moment of inertia about an 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 plane remains I. Then, radius of the disc will be

Options

(a) 2R/√15
(b) R√2/15
(c) 4R/√15
(d) R/4

Correct Answer:

2R/√15

Explanation:

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