Two small identical conducting spheres are placed with their centers 0.30m apart. One is given a charge of 12 X 10⁹^C, the other a charge of -18 X 10⁹^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.