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Action of Electrified Bodies upon Each Other

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-320

2025-11-27

471

Experiment has established the following general law concerning electrified bodies:

Bodies charged with like electricities repel each other, and those charged with unlike electricities attract each other. Compare this with the first law of magnetism.

Demonstration. - Cut out a number of pith balls with a penknife and roll them in the hands. Use the pith of corn, elder, or, better still, burdock. Suspend one of them from a bent glass rod by a fine silk thread. Electrify a straight glass rod and bring it near the ball, which will at once be attracted, cling to the rod for an instant, and then fly away charged with a + charge. Rub different bodies, such as a dry paper, a rubber comb, etc., first with silk and then with flannel. How are those charged that repel the ball? If a body attracts a charged pith ball, is it a proof that the body is charged?