Establish the Millikan's Oil experiment and explain why some of the oil droplets move upward
Recall that in the Millikan's Oil Experiment, they suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces.
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.
Why do some drops move upward?
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