$($Figure $1)$ shows five electric charges. Four charges with

the magnitude of the charge $2\mathrm{.}0nC$ form a square with

the size $a=4\mathrm{.}0cm.$ Positive charge with the magnitude

of $q=5\mathrm{.}0nC$ is placed in the center of the square.

Figure

$,$ counterclockwise from the positive $x-$axis