1988 年 57 巻 11 号 p. 3941-3945
The electric field induced by a fluxoid motion in a longitudinal magnetic field is presented. It is shown that the electric field is not given by the Josephson’s equation E=B×v, but by E=B×v−grad ψ, where B is the magnetic flux density, v is the fluxoid velocity and ψ is a scalar function. The scalar function ψ is not an electrostatic potential, since the electric field is caused by the induction and reduces to zero in the static situation (v→0). The reason for the appearance of the additional irrotational term, −grad ψ, is that v in this field geometry is a phase velocity directed normal to the Poynting flux.
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