2.Infinite line charge (density C/m) located at a distance d and parallel to an infinite conducting cylinder of radius a.

Fig 2.29: Infinite line charge and parallel conducting cylinder

Fig 2.30: Line charge and its image

The image line charge is located at and has density . See Appendix 1 for details

3.A point charge in the presence of a spherical conductor can similarly be represented in terms of the original charge and its image.