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There is a uniformly charged ring having...

There is a uniformly charged ring having radius R. An infinite line charge (charge per unit length lambda) is placed along a diameter of the ring (in gravity free space). Total charge on the ring `Q=4sqrt(2lambda)R`. An electron of mass m is released from rest on the axis of the ring at a distance `x=sqrt(3) R` from the centre.

Potential difference between points `A(x=sqrt(3)R)` and `B(x=R)i.e.(V_(A)-V_(B))` is

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