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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A solid sphere of mass M, radius R has moment of inertia 'I' about its diameter. It 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'. Radius of the disc will be [MHT-CET 2020, MHT-CET 2020]

Answer: (C)

Solution

and the disc about an edge axis has , so and

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Question ID VK-041009