Make use of Coulomb’s law here. Suppose you have a pair of electrically charged metal spheres suspended a certain distance from each other by insulating threads. There is a specific amount of electrical force between them.
(a) If the charge on one sphere were doubled, what would happen to the force between them?
(b) If the charge on both spheres were doubled, what would happen to the force between them?
(c) If the distance between the spheres were tripled, what would happen to the force between them?
(d) If the distance between them were reduced to one-fourth the original distance, what would happen to the force between them?
(e) If the charge on each sphere were doubled and the distance between them were doubled, what would happen to the force between them?
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