The flashover strength of Plexiglas insulators subjected to submicrosecond voltage impulses in vacuum and in the presence of a magnetic field that is perpendicular to the insulator surface is studied. Flashover breakdown strength is reduced by magnetic fields of a few kilogauss. Observation by fast-framing photography does not reveal curvature of the breakdown arc greater than 20°.
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Golden et al. (1977) studied this question.
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