11. (a) Eq. 21-1 gives ()()()2692212122220.0 10C8.99 10 N mC1.60N.1.50mq qFkd−×==×⋅=(b) A force diagram is shown as well as our choice of yaxis (the dashed line). The yaxis is meant to bisect the line between q2and q3in order to make use of the symmetry in the problem (equilateral triangle of side length
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Euclidean geometry, resultant force, force diagram, equal-magnitude charges