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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A solid sphere of mass M and radius R having moment of inertia I about its diameter is recast into a solid disc of radius r and thickness t. The moment of inertia of the disc about an axis passing the edge and perpendicular to the plane remains I. The R and r are related as [IIT JEE 2006]

Answer: (B)

Solution

for the sphere and for the disc about its edge; equating, $ =

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Question ID VK-040569