In the figure at the right are shown four configurations of charge labelled A, B, C, and D. The small circles are meant to represent point (i.e., very small) charges and the long rectangles are meant to represent infinite (i.e., large flat) sheets of charge whose area is perpendicular to this page. Through each figure is drawn a dotted line representing the x-axis of a coordinate system with the origin indicated by 0. (The y-axis is not shown.)
Below are shown some graphs, some of which might represent a graph of the electric potential at the locations along that axis in the various cases. For cases A through D, identify below which graphs would work for each case. If none work, put N.
Case A (point charge):
Field: ---Select--- 1 2 3 4 5 6 7 8 9 10 11 12 N
Case B (dipole):
Field: ---Select--- 1 2 3 4 5 6 7 8 9 10 11 12 N
Case C (plane of charge):
Field: ---Select--- 1 2 3 4 5 6 7 8 9 10 11 12 N
Case D (two planes of charge):
Field: ---Select--- 1 2 3 4 5 6 7 8 9 10 11 12 N
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