q1___________Q___________q2 10cm 10cm In the figure above the charge in the middle is Q=-3.1nC. For what charge q1 will charge q2 be in static equilibrium? Relevant equations I think that F=kq1q2/r^2 is relevant my attempt at a solution Since the ions are in equilibrium I assumed that F=0. so F2onQ=F1onQ=0 thus kQq2/r^2=kQq1/r^2 so [(9x10^9)(3.1x10^-9C)(q2)]/.1^2=[(9x10^9)(3.1x10^-9C)(q1)]/.1^2 but I'm not quite sure where to go from here or if I'm even going in the right direction. Please help!