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Question
The classic Millikan oil drop experiment setup is shown below. In this experiment oil drops are suspended in a vertical electric field against the gravitational force to measure their charge. If the mass of a negatively charged drop suspended in an electric field of $1.18\times 10^{-4}\textrm{ N/C}$ strength is $3.85\times 10^{-21}\textrm{ g}$, find the number of excess electrons in the drop.
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2 electrons
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