Four point charges all have the same magnitude, but they
Chapter 18, Problem 18.177(choose chapter or problem)
Four point charges all have the same magnitude, but they do not all have the same sign. These charges are fixed to the corners of a rectangle in two different ways, as Figure 18.21 shows. Consider the net electric field at the center C of the rectangle in each case. In which case, if either, is the net electric field greater? (a) It is greater in Figure 18.21a. (b) It is greater in Figure 18.21b. (c) The field has the same magnitude in both cases.
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