Two charges are located on the x axis: q1= +6.0 microcoulumbs at x1=+4.0cm, and q2=+6.0 microcoulumbs at x2= -4.0cm. Two other charges are located on the y axis: q3=+3.0 microcoulumbs at y3=+5.0cm, and q4= -8.0 microcoulumbs at y4= +7.0 cm. Find the net electric field (magnitude and direction) at the origin.
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