1. The problem statement, all variables and given/known data I attached a file. Numbers 10 and 12. 2. Relevant equations kQq/r, kQq/r^2 3. The attempt at a solution I am confused about this problem. Shouldn't the electric field strength be 0 when x = 0? The charges are opposite and adding two opposite vectors with equal magnitude should be 0 right? So how come the answer says that the electric field strength is the greatest at x = 0 then? Thank you.