The book shows that Maxwell's equations can be represented in the symmetrical form and such equations describe entire spectrum of electrodynamic processes in the material media. The equivalent diagrams of plasma media, dielectrics and magnetic materials, placed between the planes of long line are represented. The new concept of kinetic capacity is introduced, which describes the energy processes, connected with the precessional motion of the magnetic moments of atoms in the magnetized media. The concepts of the electrokinetic and magnetopotential waves, which describe wave processes in the nonmagnetic and magnetized material media, are introduced.