At each corner of a square of side $l$ there are positive point charges of magnitudes $Q_1=Q,Q_2=2Q,Q_3=9Q,$ and $Q_4=6Q($Figure $1).$

Part A

Determine the magnitude of the force on the charge $Q_2.$

Express your answer as a multiple of $\frac{k{Q}^2}{l^2}.$

$\sqrt[]{}A$

$?$

$F_{Q_2}=$

$\frac{k{Q}^2}{l^2}$

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Part B

Determine the angle made by the direction of the net force acting on the charge $Q_2$ with respect to the positive $x-$axis.

Express your answer in degrees.

$=$

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