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Electrostatics: Electric field due to four point charges

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Four point charges are located at the corners of a square in the xy plane. Their values and locations are as follows: q,(0,0); 2q,(0,a); 3q,(a,0); -4q,(a,a). Find E at the center of the square. See attachment.

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A step-by-step solution provided to find E at the center of the square. See attachment.

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