Abstract
The existence of nonstationary electromagnetic processes in a plate of compensated metal carrying a strong direct current is established theoretically. The nonstationary effects are due to the nonlinearity caused by the influence of a inhomogeneous sign-alternating magnetic field of the current on the dynamics of charge carriers. Such an influence suppresses conductivity in the entire sample except a narrow region near the zero magnetic field plane. It is found that the current pinch formed in this region can propagate quasi-statically in the direction transverse to the current. As a result, an ac electric field component (and hence, an ac voltage across the sample across the sample) appears against the background of the applied dc electric field. The ac voltage generation can be observed experimentally in a preset current mode.
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