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JEE Main 2012 Physics question

PhysicsGravitationJEE Main 2012

A point particle is held on the axis of a ring of mass m and radius r at a distance r from its centre C. When released, it reaches C under the gravitational attraction of the ring. Its speed at C will be

Answer: (3)

Solution

Potential on the axis at distance r: ; at the centre: . Energy: $Missing argument for \frac\frac =

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Question ID VK-103632