A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8450 N/C. The mass of the water drop is 3.80 10-9 kg.
(b) How many excess electrons or protons reside on the drop?
The Attempt at a Solution
i'm not sure what i'm doing wrong, but i get about 4.1071 x 10^-12 C
and for the drops i get 2.754 x 10-31
not sure why its wrong?
i used this for formula, see image: http://img180.imageshack.us/img180/6734/80350082pv3.png [Broken]
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