Two point charges of 1 nC and 2 nC are placed at the two corners of equilateral triangle of side 3 cm. The work done in bringing a charge of 3 nC…

Two point charges of $\displaystyle 1$ nC and $\displaystyle 2$ nC are placed at the two corners of equilateral triangle of side $\displaystyle 3$ cm . The work done in bringing a charge of $\displaystyle 3$ nC from infinity to the third corner of the triangle is $\displaystyle \_\_\_\_$ $\displaystyle \mu \mathrm{J}$. $$\frac{1}{4 \pi \epsilon_0}=9 \times 10^9 \mathrm{~N} \cdot \mathrm{~m}^2 / \mathrm{C}^2 $$