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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A circular disc of radius R and thickness 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

Answer: (C)

Solution

Volume: gives ; so and $ =

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Question ID VK-040576