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Top: A nerve of radius a lying in an arm of radius b. The magnetic field is in the x direction. Current inside the nerve flows in the positive z direction (out of the page) and the current in the surrounding tissue flows in the negative z direction. Bottom: The displacement caused by the Lorentz force. (a) The entire arm, and (b) a detailed view of the displacement around the nerve. The length of the displacement arrows are exaggerated for easy viewing. From Roth and Basser37.
