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Millikan’s oil drop experiment

Millikan’s famous Oil Drop Experiment.  Measure the plate separation with a virtual micrometer.  Apply a high voltage to the plates and squirt in charged particles.  Measure their speed on the screen and use Newtons 2nd Law to determine the electrostatic force and hence the charge on an electron.

There’s no setting up or clearing away time.  The experiments are always ready to use.