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Self-consistent plasma and magnetic-field dynamics in the plasma-opening-switch conduction phase is considered within the framework of 1-D single-fluid magnetohydrodynamics. The profiles of plasma-flow parameters and magnetic field in the switch current channel, depending on plasma conductivity, are obtained. An analytical solution for the magnetic-field profile in the current channel is presented. The energy partition in the current channel is calculated. The issue of plasma conductivity during the magnetic-field pulse is discussed.