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A drop of water of mass 18xx10^-3 g fall...

A drop of water of mass `18xx10^-3` g falls away from the bottom of a charged conducting sphere of radius 20 cm, carrying with it a charge of `10^(-9)C` and leaving on the sphere a uniformly distributed charge of `2.5xx10^(-6)C`. What is the speed of the drop after it has fallen 30 cm? `(4piepsi_(0))^(-1)=9xx10^(9)JmC^(-2)`

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