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A uniformly charged ring of radius 3a and total charge q is placed
in xy-plane centred at origin. A point charge q is moving towards
the ring along the z-axis and has speed v at z=4a. The minimum
value of v such that it crosses the origin is :
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E and V at a point P that lies on the axis of ring -
-
Potential energy Per unit charge -
- wherein
S.I unit is
.
Use energy conservation
Option 1)
Option 2)
Option 3)
Option 4)