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Consider an isosceles triangle of charges. At (a, 0), there is a 2 nC charge. At (-a, 0), there is a -5 nC charge. At (0, b), there is a -1 nC charge. Here a = 3.7 m and b = 7.7 m. Calculate the electric potential at the origin, 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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