Question: two small plastic spheres are given positive electrical charges when...

Two small plastic spheres are given positive electrical charges. When they are a distance of 14.6 cm apart, the repulsive force between them has a magnitude of 0.200 N . A.)What is the charge on each sphere if the two charges are equal? B.)What is the charge on first sphere if it has four times the charge of the other? C.)What is the charge on the second sphere?