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Two charges are located on the x axis: q1 = +8.9C at x1 = +3.9 cm,...

Two charges are located on the x axis: q1 = +8.9C at x1 = +3.9 cm, and q2 = +8.9C at x2 = -3.9 cm. Two other charges are located on the y axis: q3 = +3.2C at y3 = +5.4 cm, and q4 = -8.6C at y4 = +7.3 cm. Find (a) the magnitude and (b) the direction of the net electric field at the origin.

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