Question: A 0.80-m-diameter oil droplet is observed between two parallel electrodes spaced 11 mm apart. The droplet hangs motionless if the upper electrode is 20 V

A 0.80-μm-diameter oil droplet is observed between two parallel electrodes spaced 11 mm apart. The droplet hangs motionless if the upper electrode is 20 V more positive than the lower electrode. The density of the oil is 885 kg/m³.
a. What is the droplet’s mass?
b. What is the droplet’s charge?
c. Does the droplet have a surplus or a deficit of electrons? How many?

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