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Consider a square of charges, where the side length of the square is a = 2.4 m.  At each corner of the square there is a different charge.  At (0, 0), there is a 8 nC charge.  At (a, 0), there is a -9 nC charge.  At (a, a), there is a -2 nC charge.  Lastly, at (0, a) there is a 4 nC charge.  Calculate the electric potential at (a/2, 0), in V.  Use k = 9 x 109 N m2 / C2.

(Please answer to the fourth decimal place - i.e 14.3225)

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