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By using the elastic coupling through the field lines, we present a new theoretical treatment of the electrical interaction. We consider both static and oscillatory fields. The obtained results show that the static interaction energy is in reverse proportion with respect to the distance between the centers of the two bodies whereas the oscillatory interaction energy contains two terms: one which is in reverse proportion with respect to the third power of this distance and the other which is in reverse proportion with this distance. The latter term appears because of retardation. An attraction between the two charged particles of the same sign may appear if the oscillatory energy of interaction is larger than the static energy of interaction. This is the case of the electron pairs in superconductors. [ABSTRACT FROM AUTHOR]

We show that elastic coupling through flux lines gives an interaction energy between two superconductors or magnetic pieces, which is inversely proportional to the distance between the two bodies. First, we present some details on the penetration depth of the magnetic field in layered superconductors and, especially, on the vortex lines. [ABSTRACT FROM AUTHOR]