A 0.80@mm@diameter oil droplet is observed between two

Chapter 37, Problem 37.43

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A 0.80@mm@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 droplets mass? b. What is the droplets charge? c. Does the droplet have a surplus or a deficit of electrons? How many?

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