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Four particles with charges + q, + q, -q...

Four particles with charges `+ q, + q, -q, -q` are placed respectively at the comers. A, B, C, D of a sqµare of side 'a' arranged in given order. Calculate the electric potential and intensity at point 0, the center of the square. If E and Fare the midpoints of the sides BC and CD respectively, what will be the work done in displacing a charge Qfrmil OtoE and from Oto F?
`[0, -(4K qQ)/(a) ((sqrt(5)-1)/(sqrt(5)))]1`

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