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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

From a disc of radius R, a concentric circular portion of radius r is cut out, so as to leave an annular disc of mass M. The moment of inertia of this annular disc about the axis perpendicular to its plane and passing through its centre of gravity is [MHTCET 2014]

Answer: (A)

Solution

For an annulus of mass M, (difference of the terms with masses proportional to areas); (b) has the

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Question ID VK-040809