The Action of Points
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-325
2025-11-27
13
Demonstration. - Fix a pin, at its middle, to the end of a stick of sealing wax, which serves as an insulator. Charge an electroscope until the leaves are widely separated. Place the head of the pin against the knob, and observe that the leaves gradually fall together. Hold a pin in the hand and bring its point near the knob of a charged electroscope. What happens?
If the experiment with pin and sealing wax is made upon a body with a much greater charge than the electroscope, a decided current of air can be felt in front of the point. The density of the charge at the point electrifies the air particles, which, by the law of repulsion, are at once driven off. As each particle takes its own charge away, it follows that a body with pointed surfaces cannot be kept charged, however good the insulation.
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