1. The problem statement, all variables and given/known data This is more of a math question but: There are two particles fixed in place: a particle of charge +8q at the origin and a particle of charge -2q at x=L. At what point (other than infinitely far away) can a proton be placed so that it is in equilibrium 2. Relevant equations 3. The attempt at a solution The point should be at the right of the -2q charge, so it is farther away from the charge +8q. diagram: that was the answer, but would it be possible to use 8q / (L+x)2 = 2q / (x)2 where L is the distance between the charges 8q and -2q. I get x = L using this set up instead. what went wrong? Shouldn't I get the same answer?