A small drop of water is suspended motionless in air by a
Chapter , Problem 66(choose chapter or problem)
A small drop of water is suspended motionless in air by a uniform electric fi eld that is directed upward and has a magnitude of 8480 N/C. The mass of the water drop is 3.50 3 1029 kg. (a) Is the excess charge on the water drop positive or negative? Why? (b) How many excess electrons or protons reside on the drop?
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