MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

The angular momentum of two circular discs is same. The mass of the first disc is more than second disc, then the rotational K.E. is more for

Answer: (A)

Solution

For equal angular momentum, is larger for the smaller moment of inertia; for discs of equal radius is smaller for the lighter disc, so

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Question ID VK-040211