What is the magnitude of the net electric force on charge A in the description below? Assume that q1 = 1.5 nC and q2 = 5.2 nC?

Three charges: q 1 labelled A, -q 1 labelled B, and q 3 labelled C are shown in the figure. Charge -q 1 is along the horizontal line between q 1 and q 2. The distance between -q 1 and q 1 is equal to the distance between -q 1 and q 2 and is 1 centimetre.
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