Three charges are placed at the vertices of equilateral triangle of charge q each. What is the net potential energy, if the side of equilateral triangle is l ?

• A

  $\frac{1}{4{\mathrm{\pi \epsilon }}_0}\frac{{\mathrm{q}}^2}{\mathrm{l}}$

• B

  $\frac{1}{4{\mathrm{\pi \epsilon }}_0}\frac{2{\mathrm{q}}^2}{\mathrm{l}}$

• C

  $\frac{1}{4{\mathrm{\pi \epsilon }}_0}\frac{3{\mathrm{q}}^2}{\mathrm{l}}$

• D

  $\frac{1}{4{\mathrm{\pi \epsilon }}_0}\frac{4{\mathrm{q}}^2}{\mathrm{l}}$