We are given the Milikan Oil Drop experiment and we are asked to determine the causes the oil droplet's rate of fall to vary from their rate in the absence of an electric field.
Robert Millikan's oil drop experiment measured the charge of the electron.
In the Millikan oil-drop experiment (see the figure) the tiny oil drops are observed through the viewing lens as rising, stationary, or falling, as shown here.
What causes their rate of fall to vary from their rate in the absence of an electric field?
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