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The left panel displays a positive charge Q is at a distance d above a horizontal conducting plate. The bottom horizontal plate is labeled, sigma equals infinity. At V equals 0, the electric field lines direct from the positive Q towards the plane.

The right panel of the figure shows an equivalent configuration. It consists of a positive charge Q on the y axis and a negative charge Q on the negative y axis. Both the charges are at a distance of d from the origin. At V equals 0, the electric field lines direct from the positive Q to negative Q.