Two charges are located on the x axis: q 1 = +8.1C at x 1 = +5.4 cm, and q 2 = +8.1C at x 2 = -5. Two other charges are located on the y axis: q 3 =...

Two charges are located on thexaxis:q1= +8.1C atx1= +5.4 cm, andq2= +8.1C atx2= -5.4 cm. Two other charges are located on theyaxis:q3= +3.1C aty3= +5.5 cm, andq4= -10C aty4= +6.8 cm. Find(a)the magnitude and(b)the direction of the net electric field at the origin.