Ball bearings under an electric field.
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Previously:
https://www.homemadetools.net/forum/...824#post194302
https://www.homemadetools.net/forum/...433#post173610
https://www.homemadetools.net/forum/...371#post161819
https://www.homemadetools.net/forum/...4677#post80364
https://www.homemadetools.net/forum/...808#post202205