1. The problem statement, all variables and given/known data Find the net electric field strength at point A due to the combined electric fields of both charges. 2. Relevant equations E=kq/d^2 3. The attempt at a solution I know how to solve these type of problems however I'm just wondering how come in the net force line as you can see on my paper, they didn't use a -3.7*10^7 since it is going in the left direction. The answer that was given was : 3.7*10^7+ 7.71*10^6 = 4.5*10^7 N/C When I did electrostatic forces before that had charges in a line, you had to use negative when finding net force for charges that went to the left..