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Voltage measurement with pith balls

The classical experiment and exercise in electrostatics of finding the relation between the charges and the separation of two suspended charged balls is developed to the more practical problem of calculating the separation as function of the voltage. The case of more than two suspended balls is also studied, and experimental results are shown, demonstrating that the approximations used are good enough for relatively precise measurements, and that with more than three balls the solution for the disposition of the balls is not unique, with interesting stability problems arising.