The particles in Problem 19 are conducting and are brought together so that they touch....

The particles in Problem 19 are conducting and are brought together so that they touch. Charge then moves between the two particles so as to make the excess charge on the two particles equal. If the particles are then separated by a distance of 5.3 mm, what is the magnitude of the electric force between them?

(reference problem 19)

Two small particles have charges and If the magnitude of the electric force between the particles is 120 N, what is the distance between the particles?