Magnetic field coil measurements are taken in a small theta pinch operated in helium with a capacitor bank energy of 1500 J. The divided pinch coil was connected series antiparallel so that a cusped magnetic field was produced. Plots of current density, magnetic field, and J×B force density are obtained and interpreted via a generalized Ohm’s law. A substantial magnetic field overshoot occurs and is explained in terms of the plasma kinetic energy producing paramagnetic currents via the motional electromotive force. Force density plots of the pinch chamber exhibit a surface of shear in the magnetic force on the plasma which is unusual and suggestive.
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