A dipole is placed such that its center is a distance L from the surface of a long, flat conductor with thickness 2L.

A dipole is placed such that its center is a distance L from the surface of a long, flat conductor with thickness 2L. Which of the image charge diagrams below would be an appropriate one to use to find the electric force on the dipole due to the conductor? Note: All dipoles below make the same angle with the vertical.