Three Point Charges $\mathrm{q}_{1}=2.0 \mu \mathrm{C}, \mathrm{q}_{2}=2.0 \mu \mathrm{C}$ , And $\mathrm{q}_{3}=-1.0 \mu \mathrm{C}$

Three point charges, $\mathrm{q}_{1}=2.0 \mu \mathrm{C}, \mathrm{q}_{2}=2.0 \mu \mathrm{C}$ , and $\mathrm{q}_{3}=-1.0 \mu \mathrm{C}$ , are located at the vertices of an equilateral triangle of side length $30 \mathrm{~cm}$ . What is the potential energy of this arrangement?

A) $-0.12 \mathrm{~J}$
B) 0
C) $-0.24 \mathrm{~J}$
D) $0.12 \mathrm{~J}$
E) $0.24 \mathrm{~J}$