An oil droplet with 15 excess electrons is observed between two parallel electrodes spaced 12 mm apart.

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An oil droplet with 15 excess electrons is observed between two parallel electrodes spaced 12 mm apart. The droplet hangs motionless if the upper electrode is 25 V more positive than the lower electrode. The density of the oil is 860 kg/m3. What is the radius of the droplet?

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