For a superconductor, magnetisation M in a field H is

In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ∈₀(∈_r - 1) E.

Dielectric constant, under the condition of alternating fields, is a complex quantity.

The resistance of a superconductor is

If ω₀ is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ω, when a magnetic field B is acting is ω ≅ ω₀ + (e/2m)B.