A $72\mathrm{.}26$ C Charge $($Q$)$ is placed at the origin. A second charge $($Q$2=55\mathrm{.}5$ MC$)$ is placed at the

point $(4\mathrm{.}00$ m$,-3\mathrm{.}00$ m$).$ A third charge $($Q$3=55\mathrm{.}5$ MC$)$ is placed at the point $(4\mathrm{.}00$ m$,3\mathrm{.}00$ m$).$