Charged, inflated, lighter-than-air rubber balloons moored by strings form a useful electroscope which can be viewed by a large audience. The balloons are out of the demonstrator's way and are not attracted to him or to other equipment. A calculation and a graph are given which permit the device to be used as a crude electrometer capable of detecting charges smaller than a microcoulomb.
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© 1957 American Association of Physics Teachers.
1957
American Association of Physics Teachers
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