College Physics
posted by Stephanie24 .
Two tiny, spherical water drops, with identical charges of 7.10 x 1016 C, have a centertocenter separation of 1.23 cm. (a) What is the magnitude of the electrostatic force acting between them? (b) How many excess electrons are on each drop, giving it its charge imbalance?

k =9•10^9 N•m²/C²
F=k•q1•q2/r²= k•q²/r².
N=Q/e=7.1•10^16/1.6•10^19=4431
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