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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

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

Answer: (A)

Solution

For an annular disc, the moment of inertia about the central perpendicular axis is (a standard result, since

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Question ID VK-158482