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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

Two discs of moments of inertia and about their respective axes, rotating with angular frequencies and respectively, are brought into contact face to face with their axes of rotation coincident. The angular frequency of the composite disc will be

Answer: (B)

Solution

No external torque, so angular momentum is conserved: , giving $ω =

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Question ID VK-040511