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Four point charges are located at the corners of a square. Each charge has magnitude 4.00 nC and the square has sides of length 2.70 cm


Four point charges are located at the corners of a square. Each charge has magnitude 4.00 nC and the square has sides of length 2.70 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 

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

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