1. The problem statement, all variables and given/known data Calculate the direction of the electric field. There are four charges, each is at the corner of a square. One of the charges is -39 and the others are -27.7. 2. Relevant equations 3. The attempt at a solution I already got the right answer, but I don't understand the wording of the second option. What does "diagonal passed throw" mean? Thank you all very much.