Question

In the figure the four particles form a square of edge length *a* = 5.50 cm and have charges *q*_{1} = 7.48 nC, *q*_{2} = -21.4 nC, *q*_{3} = 21.4 nC, and *q*_{4} = -7.48 nC. What is the magnitude of the net electric field produced by the particles at the square's center?

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