two small conducting spheres have charge 2nc and -0.5nc respectively. When they are placed 4 cm apart ,what is the force between them. If they are brought into contact and then seperated by 4cms. What is the force between them?

Answer 1

a. F=kq1q2/distance squared.

b. if they touch, the now charge on each is (2nq-.5)/2=.75nq