Three Point Charges, Q₁ = 2

Three point charges, q₁ = 2.0 μC, q₂ = 2.0 μC, and q₃ = −1.0 μC, are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?

A) 0.24 J
B) 0.12 J
C) −0.24 J
D) −0.12 J
E) 0