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A ball of mass 10^(-2) kg and having cha...

A ball of mass `10^(-2) kg` and having charge `+ 3 xx 10^(-6)C` is tied at one end of a `1m` along thread. The other end of the thread is fixed and a charge `- 3 xx 10^(-6) C` is placed at this end. The ball can move in the circulr orbit of radius `1m` in the vertical plane. Initially, the ball is at the bottom. Find the monimum initial horizontal velocity of the ball, so that it will be able to complete the full circle.

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The correct Answer is:
`u=sqrt(58.1)=7.6` m/s
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