Four point charges, A$,$ B$,$ C$,$ and D$,$ are placed at the corners of a square with side length $L=0\mathrm{.}500m.$ Charges $A,B,$ and $C$ have charge $q,$ and $D$ has charge $-q,$ where $q=6\mathrm{.}00mC.$ Find the work needed to assemble the configuration.