Problem

What is the electric potential energy of the charges shown in the figure?
Three charges are at the vertices of a horizontally oriented rectangle that is 3.0 centimeters wide and 1.0 centimeters tall. The charge on the upper right corner is positive 8.0 nC. The charge on the lower right corner is negative 10 nC. The charge in the lower left corner is positive 10 nC.

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