ch22-p010 - 10. We place the origin of our coordinate...

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|||| G G EE 12 = ), and the net field (if there is any) should be along the y axis, with magnitude equal to G E q d q d q d q d net jj =− F H G I K J F H G I K J 1 4 2 1 4 12 4 3 0 4 2 3 2 0 22 ππ εε b g ±± which is seen to be zero. A rough sketch of the field lines is shown below: 10. We place the origin of our coordinate system at point P and orient our y axis in the direction of the q 4 = –12 q charge (passing through the q 3 = +3 q charge). The x axis is perpendicular to the y
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