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A schematic diagram of a nerve of radius a carrying action current Ji (black, thick arrows) along both the z axis and in the radial direction, in a static magnetic field (blue, thick arrow) of strength Bo oriented parallel to the axon (the z direction). The Lorentz force F (red, thin arrows) causes the nerve to rotate about the z axis. The intracellular conductivity is σi, and the extracellular conductivity is σe.
