Abstract: This research is devoted to the presentation of the method of moments: brief overview of other numerical methods, theoretical foundation formulation of integral equations, development of the matrix method and examples. In this study, we will discuss the detailed study of the Method of Moments (MoM) while making a brief description of the theoretical basis of some other numerical methods used in solving electromagnetic problems. For this, we have written a code in Fortran 90 based on the MoM numerical method that we have applied to some electromagnetic problems and also, a model which is interesting in electronic, the charge density of conductive wire in this study.