Maxwell’s equations in a rotating medium: Is there a problem?

Autor:	Gerald N. Pellegrini, Arthur R. Swift
Rok vydání:	1995
Předmět:	Electromagnetic field Physics Electric dipole moment symbols.namesake Classical mechanics Theory of relativity Spacetime Magnetic energy Maxwell's equations Moving magnet and conductor problem symbols General Physics and Astronomy Magnetic dipole
Zdroj:	American Journal of Physics. 63:694-705
ISSN:	1943-2909 0002-9505
DOI:	10.1119/1.17839
Popis:	In 1908 Einstein and Laub used special relativity to predict that a moving magnetic dipole develops an electric dipole moment. The classic 1913 experiment of Wilson and Wilson on a polarizable, permeable medium rotating in an external magnetic field has long been cited as verifying this prediction. We argue that since the experiment involved rotation rather than uniform translation, it did not test special relativity. The analysis should properly be done in a rotating coordinate system. The field equations for a rotating object are well known and the analysis is straightforward, but the result disagrees with the Wilson experiment. After carefully examining all steps in the derivation, we conclude that either the experiment is wrong or the theoretical analysis must be modified. One possible resolution of the conflict is the hypothesis that the dielectric constant e and permeability μ are well defined only in a frame in which the medium is at rest and time and space are orthogonal coordinates.
Databáze:	OpenAIRE
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