Third boundary condition formulation for electromagnetic field problems

The paper deals with the problem of formulation of Hankel's boundary condition for an electromagnetic field (the so-called third condition). In comparison to the heat transfer and the temperature distribution problems, this condition for electromagnetic field problems should be introduced by means of a more complicated procedure. Indeed, Hankel's condition for the temperature field problems can be easily derived from the convection principle. An analogous principle which may lead in such a simple way to Hankel's boundary condition does not exist for the electromagnetic field problems. Hankel's condition has been formulated for several shapes of the boundary surface by means of the field analysis. An example which emphasises the importance of this problem has been provided.