Two small identical conducting spheres are placed with their centers 0.64 m apart. One is given a charge of 12×10⁻⁹ C, the other a charge of −17×10⁻⁹ 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.