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تسجيل

Measure of Electrical Attraction and Repulsion

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-321

2025-11-27

561

If two-minute bodies with equal charges of like electricities when a one centimeter apart in air, repel each other with force of one dyne, each charge of electricity is called a unit charge. If one of these unit charges remained the same, the other would need to be increased to 10 units in order to increase the force of repulsion to 10 dynes. It is found that the force of electrical repulsion or attraction between any two small electrified bodies varies directly as the product of the charges, and inversely as the square of the distance between their centers. Hence

in which f is the force in dynes, Q and q the electrical charges of the bodies, and d the distance between their centers in centimeters. By reference to the law of mutual action it will be seen that the + sign means repulsion and the - sign attraction.