I'm seeing a lot of problems in my textbook where it asks you to find the point near two charges where the total electric field is zero. Whats the logic behind figuring out if the point will be on the left side, the right side, or between the two charges? For example, one problem says there are two charges -7uc and 28uc seperated by 2 m. It asks you to find the point where the electric field is zero. How do you tell if the point will be on the left side of the -7uc, the right side of the 28uc, or in between? I have no problem solving these problems once I know where the point is going to be, but thats the major hurdle.