where J is the vector of current density, r is the specific material conductivity, E is the vector intensity of the electrical field and Vðx; yÞ is the potential at point ðx; yÞ
where J is the vector of current density, r is the specificmaterial conductivity, E is the vector intensity of the electricalfield and Vðx; yÞ is the potential at point ðx; yÞ