How potentials in different gauges yield the same retarded electric and magnetic fields

Details How potentials in different gauges yield the same retarded electric and magnetic fields How potentials in different gauges yield the same retarded electric and magnetic fields

2007-02-24

arxiv.org/abs/physics/0702217v1

Am. J. Phys. 75, 176-183 (2007)

Physics

Classical Physics

Scientific paper

10.1119/1.2400238

This paper presents a simple and systematic method to show how the potentials in the Lorentz, Coulomb, Kirchhoff, velocity and temporal gauges yield the same retarded electric and magnetic fields. The method appropriately uses the dynamical equations for the scalar and vector potentials to obtain two wave equations, whose retarded solutions lead to the electric and magnetic fields. The advantage of this method is that it does not use explicit expressions for the potentials in the above gauges, which are generally simple to obtain for the scalar potential but generally difficult to calculate for the vector potential. The spurious character of the term generated by the scalar potential in the Coulomb, Kirchhoff and velocity gauges is noted. The non spurious character of the term generated by the scalar potential in the Lorenz gauge is emphasized.

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