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Millikan's oil-drop experiment By using an apparatus in which oil droplets were given an electrical charge by irradiation with X rays, the oil drops' descent due to gravity could be countered by application of charge to plates on the top and bottom of the apparatus. The upper plate was positively charged and the lower plated negatively charged. By monitoring the size of the drops, the rate of fall, and the charge on the plates, Millikan determined that all drops carried an integer multiple of $-1.60 \times 10^{-19}$ C, where C is a coulomb, which is a unit of electrical charge.

          Millikan's oil-drop experiment
By using an apparatus in which oil droplets were given an electrical charge by irradiation with X rays,
the oil drops' descent due to gravity could be countered by application of charge to plates on the top
and bottom of the apparatus. The upper plate was positively charged and the lower plated negatively
charged. By monitoring the size of the drops, the rate of fall, and the charge on the plates, Millikan
determined that all drops carried an integer multiple of $-1.60 \times 10^{-19}$ C, where C is a coulomb,
which is a unit of electrical charge.

Millikan's oil-drop experiment
By using an apparatus in which oil droplets were given an electrical charge by irradiation with X rays,
the oil drops' descent due to gravity could be countered by application of charge to plates on the top
and bottom of the apparatus. The upper plate was positively charged and the lower plated negatively
charged. By monitoring the size of the drops, the rate of fall, and the charge on the plates, Millikan
determined that all drops carried an integer multiple of -1.60 × 10^-19 C, where C is a coulomb,
which is a unit of electrical charge.

Added by Elisa P.

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