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Millikan's oil drop experiment was used to determine

  1. Athe charge on the electron
  2. Bthe mass of the electron
  3. Cthe charge-to-mass ratio of the electron
  4. Dthe mass of the neutron

Answer: A

Millikan balanced the weight of tiny charged oil drops against an electric force and found the drop charges to be integral multiples of a basic unit, the electronic charge. e/m came from Thomson's experiments.
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