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Question
(a) Using the symmetry of the arrangement, determine the direction of the electric field at the center of the square in Figure 18.52, given that $q_a = q_b = -1.00 \textrm{ }\mu\textrm{C}$ and $q_c = q_d = +1.00 \textrm{ }\mu\textrm{C}$. (b) Calculate the magnitude of the electric field at the location of $q$, given that the square is 5.00 cm on a side.
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$2.03 \times 10^7 \textrm{ N/C, up}$

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