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Four point charges are located at the corners of a square. Each charge has magnitude 3.50...

Four point charges are located at the corners of a square. Each charge has magnitude 3.50 nC and the square has sides of length 3.20 cm. Find the magnitude of the electric field (in N/C) at the center of the square if all of the charges are positive and three of the charges are positive and one is negative.

(a) all the charges are positive N/C

(b) three of the charges are positive and one is negative N/C

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