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 recasted into a solid sphere. The moment of inertia of the sphere about its diameter as axis of rotation is

(a) I

(b) 2I/8

(c) I/5

(d) I/10

Ans. c

(5)

5/5 - (1 vote)

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