A uniformly charged ring of radius 3a and total charge q is placed in xy-plane centered at origin. A point charge q is moving towards. A uniformly charged ring of radius 3a and total charge q is placed in xy-plane centered at origin. A point charge q is moving towards the ring along the z-axis and has speed v at 
. The minimum value of v such that it crosses the origin is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2019
Potential at any point of the charged ring
The minimum velocity (v 0 ) should just sufficient to reach the point charge at the center, therefore
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