College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 53

Two small identical conducting spheres are placed with their centers 0.30 m apart. One is given a charge of 12 × 10 9 C, the other a charge of 218 × 10 9 C. (a) Find the electrostatic force exerted on one sphere by the other. (b) The spheres are connected by a conducting wire. Find the electrostatic force between the two after equilibrium is reached, where both spheres have the same charge.