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Three equal point charges, each with charge 1.00?C , are placed at the vertices of an equilateral triangle whose sides are of length 0.550m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)
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r = distance between the harges = 0.55

U = 3 K q^2 / r

= 3 * (1 / (4 * pi * 8.85 * 10^(-12))) * (10^(-6))^2 / 0.55

= 0.04904 J

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