I had a question (very similar to this) for homework a few days ago, which was basically: In which arrangement will the electric field at the leftmost point be largest and in which will it be the smallest? A. (+)-------(+) B. --------(+)-------(+) or C. ----(+)---(+) I assumed it would be A since the point charge is AT the leftmost point, and through the method that acts like there is a positive charge at a point to estimate the direction and magnitude of the electric field, I got the magnitude of the electric field at that point to be infinite since it is at the same point as the charge. (r2 in denominator becomes zero) What am I doing wrong?