Figures 3 and 4 depict the finite element
solution in the form of isovoltage contours overlayed on the
finite element mesh at two mesh
densities.

Figure 3. Finite element solution in the form of isovoltage contours overlayed on the finite element mesh for a small mesh density.

Figure 4. Finite element solution in the form of isovoltage contours overlayed on the finite element mesh for a medium mesh density.