Short, magnetically driven, low-current arcs have been studied using a system of two concentric electrodes, the upper of which could be rotated by an electric motor. These experiments have confirmed that at low pressure the arc motion is completely controlled by cathode processes. Even at pressures approaching atmospheric the arc motion appears to be only slightly affected by phenomena occurring in the interelectrode gas space.
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Chaudhry et al. (1968) studied this question.
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