Two identical conducting small spheres are placed with their centers 0.300m apart. One is given a charge

Question:

Two identical conducting small spheres are placed with their centers 0.300m apart. One is given a charge of 12.0 nC and the other a charge of −18.0 nC.
(a) Find the electric force exerted by one sphere on the other.
(b) What If? The spheres are connected by a conducting wire. Find the electric force between the two after they have come to equilibrium.