Pictures of an atmospheric pressure arc between two concentric copper electrodes at different external magnetic fields ( field) were taken using a charge-coupled device camera and a complementary metal-oxide-semiconductor camera. The pictures reveal splitting of the arc column into a column with multiple arc roots (i.e., cathode spots), repulsion of cathode spots due to their self-induced fields, and grouping of cathode spots under the influence of field. Power frequency spectra analysis of the voltage fluctuations was also performed.
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