Physics – Classical Physics
Scientific paper
2006-07-14
Eur. J. Phys. 27 (2006) 1391--1398
Physics
Classical Physics
5 pages, 3 figures. New discussions added. Minor changes
Scientific paper
10.1088/0143-0807/27/6/013
For several configurations of charges in the presence of conductors, the method of images permits us to obtain some observables associated with such a configuration by replacing the conductors with some image charges. However, simple inspection shows that the potential energy associated with both systems does not coincide. Nevertheless, it can be shown that for a system of a grounded or neutral conductor and a distribution of charges outside, the external potential energy associated with the real charge distribution embedded in the field generated by the set of image charges is twice the value of the internal potential energy associated with the original system. This assertion is valid for any size and shape of the conductor, and regardless of the configuration of images required. In addition, even in the case in which the conductor is not grounded nor neutral, it is still possible to calculate the internal potential energy of the original configuration through the method of images. These results show that the method of images could also be useful for calculations of the internal potential energy of the original system.
Diaz Rodolfo A.
Herrera William J.
Niño Virgilio J.
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