Asked by Tim

(a) Two point charges totaling 7.50 µC exert a repulsive force of 0.100 N on one another when separated by 0.561 m. What is the charge on each?
Answered by Steve
F = q1*q2/d^2
so,

q1(7.50*10^-6 - q1)/.561^2 = 0.100
Answered by Chanz
Dropped the k there Steve.
F = kq^2/r^2
q= sqrt(Fr^2/k)