$($Figure $1)$ shows five electric charges. Four charges with the magnitude of the charge $2\mathrm{.}0nC$ form a square with the size $a=3\mathrm{.}5cm.$ Positive charge with the magnitude of $q=1\mathrm{.}5nC$ is placed in the center of the square.

What is the magnitude of the force on the $1\mathrm{.}5nC$ charge in the middle of the figure due to the four other charges?

Express your answer with the appropriate units.

$F_{onq}=$

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Part B

What is the direction of the force on the $1\mathrm{.}5nC$ charge in the middle of the figure due to the four other charges?

Express your answer in degrees to two significant figures.

$=$

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