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A small ball having charge +q and mass m...

A small ball having charge `+q` and mass `m` is suspended at one end of a light string of length and can rotate in vertical plane.A uniform electric field `E` exists in the region in vertically upward direction `(mg>qE)` .The minimum velocity required to be imparted to the ball at the lowest position in order to successfully negotiate the circular loop is `sqrt(x(g-(qE)/(my)))` then find `x+y` .`x & y` are lowest possible integer.

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