1. The problem statement, all variables and given/known data Three point charges are on the x-axis at 0m, 0.2m, and 0.4m, with charges -19microC, +19microC, and +19microC respectively. There are two places where the electric field is zero. One is between 0.2 and 0.4m. Where is the other place? 2. Relevant equations i used the equation E=kq/r2 3. The attempt at a solution I first recognized that the point must be to the left of the first charge. Then, i tried to set up an equation summing the E field vectors: (kq/r^2)-(kq/(r+0.2)^2)-(kq/(r+0.4)^2)=0 With this equation, i could not simplify to find a suitable x value. I then tried to sum the E field due to the charges at 0.2m and 0.4m, and then use that to determine the distance r that the Electric field would be zero. I did this by recognizing that kq/(0.2)^2+kq/(0.4)^2=E', or the collective E field at 0m. I was then going to use E'=kq/x^2 because the fields are in opposite directions but have to be equal for the next field to be zero. This approach gave me the wrong answer. Where am i going wrong?