two charged conducting spheres are separated by a distance d, as shown in the figure above. one sphere has charge 5q, the other has charge -q, and the diameter of each sphere is much smaller than d. each sphere exerts a force of magnitude f on the other. the spheres are brought together and touch briefly. after touching, the left sphere has charge 2q. the spheres are then returned to their original locations. what is the magnitude of the new force between the spheres?
