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 an electron was initially at rest at a point A which is very far always from the centre and on the axis of the ring is:

Options

A. `sqrt(((2KQe)/(mR)))`
B. `sqrt(((KQe)/(m)))`
C. `sqrt(((Kme)/(QR)))`
D. `sqrt(((KQe)/(mR)))`

Answer

A