Consider the three nnint mharna in tha.....$-$lane as shown in the figure.

$x(cm)$

What is the total electrostatic energy of the system? The point charges have the following values: $Q_1=5\mathrm{.}21nC,Q_2=6\mathrm{.}65nC,Q_3=-7\mathrm{.}96nC.$ ries $\frac{0}{12}$

Point charge $Q_3$ is moved away to infinity by an external force. How much work did the external force perform in this process?

Tries $\frac{0}{12}$