Question: A point charge is placed at each corner of a square with side length a . The charges all have the same magnitude q. Two

A point charge is placed at each corner of a square with side length a . The charges all have the same magnitude q. Two of the charges are positive and two are negative, as shown in the following figure.

What is the magnitude of the net electric field at the center of the square due to the four charges in terms of q and a?

+q 9

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