1. The problem statement, all variables and given/known data you have a +3C and a -1C charge on the x axis. the +3C charge is at the origin and the -1C is at x=1. At what point on the positive x axis does E=0? 2. Relevant equations E=kQ/r^2 3. The attempt at a solution So i have E=(-1k/r^2)+(3k/(1+r)^2) Setting E=0 1k/r^2=3k/(1+r)^2 r= sqrt(0.5) = 0.707 is this correct?