A small ball of mass 2 xx 10^(-3) kg hav...

A small ball of mass `2 xx 10^(-3)` kg having a charge of `1 muC` is suspended by a string of length 0.8 m. Another identical ball having the same charge is kept at the point of suspension. Determine the miniumum horizontal velocity which should be imparted to the lower ball, so that it can make complete revolution.

`6.2 ms^(-1)`

`9.8 ms^(-1)`

`11.6 ms^(-1)`

`5.86 ms^(-1)`

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