A study has been conducted of the phenomena occurring when a hydrogen plasma is caused to flow through a transverse magnetic field. Plasma polarization effects were studied as well as the deceleration processes which occurred when large currents were extracted from the plasma. Standing ``wedge‐shaped'' shock waves were observed when sufficient current was extracted to permit the deceleration phenomena to be manifested. The effective plasma resistance between electrodes was determined, and a correlation made with plasma conductivity measurements, including boundary layer effects. Finally, a determination was made of the power and energy extracted from the plasma.