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(B) The quantization of electric charge was experimentally demonstrated by Robert $A$. Millikan in his famous oil drop experiment. In this experiment,

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Millikan's oil drop experiment

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(B) The quantization of electric charge was experimentally demonstrated by Robert $A$. Millikan in his famous oil drop experiment. In this experiment,tiny oil droplets were sprayed into a chamber. By observing the motion of these droplets under the influence of gravity and a uniform electric field,Millikan found that the charge $q$ on any oil drop was always an integer multiple of a fundamental charge $e$,i.e.,$q = ne$,where $n = 1, 2, 3, ...$. This proved that electric charge is quantized.

Which experiment was used to determine the quantization of electric charge?

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