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Continuing investigation into possible electric fields arising from steady conduction currents
Phys. Rev. D 14, 922 – Published 15 August, 1976
DOI: https://doi.org/10.1103/PhysRevD.14.922
Abstract
Recently a report was made of an effort to test higher-order, source-velocity terms in Maxwell's equations. Present electromagnetic theory predicts a zero electric field resulting from constant currents in closed conductors at rest, but Edwards has reported observing an -dependent potential resulting from current in a superconducting Nb-Ti coil. We have repeated these experiments under several variations to confirm the functional nature of the effect and to test the possibility of its arising from causes consistent with Maxwell's equations. In a fitting of the function where is the observed potential, we have obtained the value . We have also concluded that none of the following effects offers a satisfactory explanation: the self-Hall effect, configurational emf's, non-steady-current effects, thermoelectric effects, flux-flow emf's, and possible charge transfer on helium bubbles. The signal appears to be a real field effect and is as yet unexplained.
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