In a Millikan oil-drop experiment,  a particular oil drop weighs 4.37×10^−14 N. The parallel plates are separated by a distance of 1.80 cm. When the potential difference between the plates is 546 V, the drop is suspended. a. What is the net charge on the oil drop? b. If the upper plate is positive, how many excess electrons are on the oil drop?

Physics for Scientists and Engineers
10th Edition
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter22: Electricity And Magnetism
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Problem 28P: You are working on a research project in which you must control the direction of travel of electrons...
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In a Millikan oil-drop experiment, 
a particular oil drop weighs 4.37×10^−14 N. The parallel plates are separated by a distance of 1.80 cm.
When the potential difference between the plates is 546 V, the drop is suspended.


a. What is the net charge on the oil drop?


b. If the upper plate is positive, how many excess electrons are on the oil drop?

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