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In Robert Millikan's oil drop experiment, a fine mist of oil droplets are sprayed into a container with an electrically charged gas. The oil droplet's location is monitored by using a microscope as it passes between two charged plates. However, in the experiment, the oil droplets are also charged. The gas in the chamber is ionized by exposing it to x-rays, but what gives the oil droplets their charge and are they positively or negatively charged?
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