Abstract
The axial and radial components of the electric field in a hydrogen arc with superimposed axial magnetic field have been measured with potential probes. The axial field was found to be only 3.1 V/cm, whereas in the radial direction fields up to 400 V/cm indicate a rotation of the arc. Radial fields are caused by υ x 23 e. m. forces due to this rotation. The probe measurements indicate velocities of the order of 106 cm/sec which are confirmed by Doppler shift measurements. A simple model is considered in which Lorentz forces cause a rotation of the arc; calculations are in agreement with the measurements. Axial velocities (2 · 104 cm/sec) have also been determined, by measuring the velocity of a perturbation due to the probe. This perturbation travels downstream in the arc and is observed as a small drop in the arc voltage passing the anode region.
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