In the figure the four particles form a square of edge length a = 4.10 cm and have charges q1 = 8.11 nC, q2 = -21.6 nC, q3 = 21.6 nC, and q4 = -8.11 nC. What is the magnitude of the net electric field produced by the particles at the square's center?
image was not given so i have taken charges as shown in figure.
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