Electric potential energy

Three equal point charges, each with charge \( 1.00 \text{ } \mu \text{C} \), are placed at the vertices of an equilateral triangle whose sides are of length \( 0.7 \text{ m}. \) What is the approximate electric potential energy \( U \) of the system?

Take as zero the potential energy of the three charges when they are infinitely far apart. Use \( \varepsilon_{0} = 8.85×10^{−12} \) for the permittivity of free space.

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