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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A disc of radius R and thickness has moment of inertia I, about an axis passing through its centre perpendicular to its plane. Disc is melted and reduced into a solid sphere. The moment of inertia of a sphere about its diameter is [MHTCET 2016]

Answer: (A)

Solution

Equal volumes: gives ; and

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Question ID VK-040796