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Title: The Millikan oildrop experiment
Caption: The Millikan oildrop experiment. Oil drops irradiated with X-rays pick up electrons and become negatively charged. Their fall due to gravity can be balanced by adjusting the voltage of the electric field. The charge on the oil drop can be determined from the applied voltage and the mass of the oil drop. The charge on each drop is that of some whole number of electrons.
Keywords: Millikan oildrop experiment, x-rays, electrons, voltage