Friction Develops Both Kinds of Electricity
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-323
2025-11-27
26
Demonstration. - Rub a glass rod and an ebonite rod together, much as a mower whets his scythe. Test each by bringing it near the knob of an electroscope. The glass will be found to be charged positively and the ebonite will show an equal negative charge.
Tests carefully made by rubbing various substances together show not only that both kinds of electricity are produced, but also that the opposite charges generated are equal in amount. For instance, the + charge generated upon a glass rod is the same in quantity as the - charge generated upon the silk by which it is rubbed.
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