FEM is a numerical technique for solving partial differential and integral equations met in many practical engineering problems. The region where the electric field intensities are to be found, including the surrounding region, is notionally divided into a large number of small non-separated, non-overlapping sub-regions, called finite elements. This process is called meshing. These finite elements can take a number of shapes, but generally triangular shapes are used for 2-D analysis. The potential, which is unknown throughout the region is approximated in each of these elements in terms of the potential at their vertices. For each node in the grid, the finite element method is used to set up an equation for the potential as a function of those elements for the surrounding nodes [6.3].