A charge +Q is uniformly distributed over a thin ring of the radius R. The velocity of an electron at the moment when it passes

A charge +Q is uniformly distributed over a thin ring of the radius R. The velocity of an electron at the moment when it passes through the centre O of the ring, if the electron was initially at far away on the axis of the ring is (m=mass of electron, `K=1/(4pi epsi_(0))`)
A. `sqrt(((2KQe)/(mR)))`
B. `sqrt(((Kqe)/m))`
C. `sqrt(((Kme)/(QR)))`
D. `sqrt(((Kqe)/(mR)))`

A charge +Q is uniformly distributed over a thin ring of the radius R. The velocity of an electron at the moment when it passes through the centre O o

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