The main vectors among those used for description of electromagnetic field

Calculated value of force acting on a body participating in electromagnetic process depends on selection of pair of vectors used for description of electromagnetic field. Analysis of possible representation of Pointing formula reveals that during description of field/substance interaction, assumed in classical electrodynamics, application of E and H pair only enables identification of total electromagnetic energy satisfying conformity principle to the known processes in plane wave, and to the free energy - in statics. Derivation of London brothers equation of superconductivity theory is presented as an example of application of total energy concept.