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