The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 21
on qualitatively, but also to form an estimate of theactual magnitude of these forces. The apparatus consists essentially of two light balls A, C, fixed at the twoends of a rod which is suspended at its middle point 5 by a very fine threadof silver, quartz or other material. The upper end of the… … condition for equilibrium is obviously that there shall be no torsion inthe thread. If, however, we fix a third small ball E in the same plane as the other two, and if the three balls are elec-trified, the forces between the fixed ball andthe movable ones will exert a couple on themoving rod, and…
Electricity · Magnetism
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