Question

Two charges are located on the x axis: q1 = +4.7C at x1 = +4.2 cm, and q2 = +4.7C at x2 = -4.2 cm. Two other charges are located on the y axis: q3 = +3.9C at y3 = +4.9 cm, and q4 = -11C at y4 = +6.2 cm. Find (a) the magnitude and (b) the direction of the net electric field at the origin.

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