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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A circular disc X of radius 'R' is made from a metal plate of density 'q' and thickness 't'. Another disc Y of radius '4R' of thickness is prepared from the same metal. The ratio of their moments of inertia is [MHT-CET 2020, MHT-CET 2020]

Answer: (D)

Solution

Mass , so and gives

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Question ID VK-041020