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What is the electric field at the center of a square with charges placed at each corner?

Question:

Consider a square which is 1.0 m on a side. Charges are placed at the corners of the square as follows: 4.0 uC at (0,0); 4.0 uC at (1,1); 3.0 uC at (1,0); -3.0 uC at(0,1). What is the magnitude of the electric field at the square's center?

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