A total charge of 7.5 x 10^-6C is distributed on two different small metal spheres. When the spheres are 6.0cm apart, they feel a repulsive force of 20.0 N. How much charge is in each sphere?

A 7.21µC, 0.29 µC

B 3.5µC, 4.0 µC

C 6.21µC, 1.29 µC