Question

Two electrically charged spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios below:
A: the charge on one sphere is reduced by half
B: the distance between the spheres in increased by a factor of three
C: the charge on both spheres is doubled
D: the distance between the spheres is decreased to a factor of 1/4
E: the charge of each sphere is doubled and the distance between them is doubled.