Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A particle of mass m and charge +q approaches from a very large distance towards a uniformly charged ring (not fixed) of radius R and charge, mass same as that of particle, with initial velocity 
along the axis of the ring as shown in figure. What is the closest distance of approach between the ring and the particle? Assume the space to be gravity free and frictionless?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
At the tension of closest approach both particle and ring would be moving at same speed so we use
By energy conservation we have
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