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Statement of a problem № 3660

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Electronic charge e may be determined by Millikan's oil drop method. Oil drops of radius r acquire a terminal speed v1 with downward electric field E and a speed v2 with the upward electric field. Derive an expression for e in terms of E, v1, v2, r and S, the viscosity of oil in air.

Solution:
Electronic charge e may be determined by Millikan's oil drop method. Oil drops o

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