How much work was required to put together the charge configuration shown in the figure below? Give your answer in mJ (milli-Joules). The charges have the following values: q1=-0.81 µC, q2=-1.97 µC, q3=-0.55 µC, q4=-9.64 µC.
please use symbols such as
V=K(q/r...), change in PE=-W. Thank you.