1. The problem statement, all variables and given/known data Two particles with positive charges q1 and q2 are separated by a distance s. Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? 2. Relevant equations E = kq/r2 where k = 1/(4 x pi x epsilon-nought) 3. The attempt at a solution Ok so basically the picture is something like this q1-------P--------q2 |<---distance s-->| Where ive placed the point P randomly in between charges q1 and q2. Ive called the distance between q1 and p "x", and the distance between q2 and p "s-x" So ive basically substituted q1 and x into the equation. Then i substituted q2 and (s-x) into the equation. Then i equated E1 and E2 to obtain a quadratic equation. x2(q1-q2) - x2q1s + q1s2 = 0 Ive gone ahead and solved this for x using the quadratic formula. Since there were two answers cause of the plus minus, i just eliminated the minus part of it to get x = [2q1s + root(4q1q2s2)] / 2(q1 - q2) I cancelled out the 2's on the top and the bottom. However when i input my answer its not correct. Maybe i made a mistake somewhere? I dont know i cant seem to find one for now.