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NEET 2004 Physics question

PhysicsSystems of Particles and Rotational MotionNEET 2004

A round disc of moment of inertia about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia rotating with an angular velocity about the same axis. The final angular velocity of the combination of discs is :-

Answer: (2)

Solution

No external torque acts about the axis, so angular momentum is conserved: , giving . (1)

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Question ID VK-089362