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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A cord is wound round the circumference of a wheel of radius . The axis of the wheel is horizontal, and its moment of inertia about it is . A weight is attached to the end of the cord and falls from rest. After falling through a distance , the angular velocity of the wheel will be

Answer: (B)

Solution

Energy conservation: , with : \dfrac$12m

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Question ID VK-158740