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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

Two discs of the same thickness but of different radii are made of two different materials such that their masses are the same. The densities of the materials are in the ratio 1:3. The moments of inertia of these discs about the respective axes passing through their centres and perpendicular to their planes will be in the ratio

Answer: (B)

Solution

Equal mass, equal thickness: Missing superscript or subscript argumentρ_1R_1^2Missing superscript or subscript argument=ρ_2R_2^2$⇒

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Question ID VK-159130