The evolution of the Finite Element Method (FEM) is intimately linked to developments in engineering and computer sciences. Its application in a variety of areas, especially in the nuclear, aeronautics, and transportation industries, is a testimony to the high degree of accuracy the method is capable of, as well as to its ability to model complex problems. Generally, in Electromagnetics, the FEM is associated with variational methods or residual methods. Residual methods are established directly from the physical equation that has to be solved. It is a considerable advantage compared with the variational methods since it is comparatively simpler and easier to understand and apply. The Galerkin method is a particular form of residual methods and it is widely used in electromagnetism. This particular formulation is simple, practical to implement, and, moreover, normally provides precise and accurate results.