and D of a square are occupied by charges q

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The corners A, B, C , and D of a square are occupied by charges q, -q , 2Q and Q respectively . The side of square is 2b. The field at the midpoint of side CD is zero. What is the value of q/Q?
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The corners A, B, C , and D of a square are occupied by charges q, -q , 2Q and Q respectively . The side of square is 2b. The field at the midpoint of side CD is zero. What is the value of q/Q? -q 2Q and Q respectively . The side of square [...]
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Tags: -q , 2Q and Q respectively . The side of square is 2b. The field at the midpoint of side CD is zero. What is the value of q/Q? , and D of a square are occupied by charges q , B , C , The corners A ,