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In a stationary hydrogen arc with axial magnetic field the radial distribution of the axial electric field E z  was measured by shooting a double potential probe across the arc. It was found that E z  strongly decreases outside the magnetic flux tube defined by the cathode radius and tends to zero. The measured distribution of E z  agrees qualitatively with computations allowing for the observed rotation profile. In a very fast rotating arc with a hollow anode E z  was found to vanish not only outwards, but also towards the axis, as predicted by the theory.

Messungen der radialen Verteilung der elektrischen Feldstärke im Wasserstofflichtbogen mit axialem Magnetfeld