A note on "Measuring propagation speed of Coulomb fields" by R. de Sangro, G. Finocchiaro, P. Patteri, M. Piccolo, G. Pizzella
D. M. Gitman, A. E. Shabad, A. A. Shishmarev
TL;DR
This paper clarifies the relationship between the Feynman formula and Lienard-Wiechert potentials for the electromagnetic field of a moving charge, confirming their equivalence through theoretical demonstration.
Contribution
It provides a rigorous demonstration that the Feynman formula and Lienard-Wiechert potentials are fully identical in describing Coulomb fields of moving charges.
Findings
Confirmed the equivalence of Feynman formula and Lienard-Wiechert potentials.
Clarified theoretical foundations of Coulomb field propagation.
Supported previous experimental measurements with a formal proof.
Abstract
In connection with the discussion and the measurements fulfilled in [R. de Sangro et al., Eur. Phys. J. C 75 (2015) 137], the full identity is demonstrated between the Feynman formula for the field of a moving charge and the Lienard-Wiechert potentials.
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