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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A disc of moment of inertia is rotating with angular velocity about an axis perpendicular to its plane and passing through its centre. If another disc of moment of inertia about the same axis is gently placed over it, then the new angular velocity of the combined disc will be

Answer: (B)

Solution

Conservation of angular momentum: , so , which is less than

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Question ID VK-040731