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It is well known that electric and magnetic fields may change when they areobserved from different frames of reference. For example, the motion of acharged probe particle moving parallel to a current-carrying wire would bedescribed by utilizing different electric or magnetic fields, depending on fromwhich frame of reference the system is observed and described. To describe thesituation in all frames by utilizing the theory of relativity, one has to firstdescribe the situation in one particular frame, and this choice in the case ofa current-carrying wire is the topic of this paper. In this study I examine analternative to the standard choice, and consider its theoretical andexperimental validity. An outcome of the alternative approach is that in therest frame of a wire, running a current introduces also an electric field bygiving rise to a minute charge. Present day experimental sensitivities,specifically those of cold ions, may be able to differentiate between theobservable signatures predicted by the different approaches.

On the possibility of a relativistic correction to the E and B fields around a current-carrying wire