10. We place the origin of our coordinate system at point Pand orient our yaxis in the direction of the q4= –12qcharge (passing through the q3= +3qcharge). The xaxis is perpendicular to the yaxis, and thus passes through the identical q1= q2= +5qcharges. The individual magnitudes ||, ||, ||,GGGEEE123and ||GE4are figured from Eq. 22-3, where the absolute value signs for q1, q2, and q3are unnecessary since those charges are positive
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