1. The problem statement, all variables and given/known data Particle 1 of charge q1 = +0.76 µC and particle 2 of charge q2 = -3.0 µC, are held at separation L = 13 cm on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the x and coordinates of particle 3? I'm really not sure how to proceed with this question. But I understand that the forces added together is zero.