# Falling charged water drop

A water drop of $$18 \times 10^{-3} g$$ falls from a charged sphere . The drop's charge is $$10^{-9} C$$ . There remains $$2.5 \times 10^{-6} C$$ in the sphere . The radius of the sphere is $$20 cm$$ . When the drop falls $$30 cm$$ , what will be its velocity in $$ms^{-1}$$ ?

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