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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 and perpendicular to its plane. Disc is melted and recast into a solid sphere. The moment of inertia of a sphere about its diameter is [MHT-CET 2023, MHT-CET 2023]

Answer: (A)

Solution

Equal volume gives sphere radius ; and

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Question ID VK-040838