File:Helmholtz coil, B magnitude cross section.svg - Wikipedia

English: Cross section of B (magnetic field strength) magnitude in a Helmholtz coil (actually consisting of two coils: one at the top, one at the bottom in the plot). The eight contours are for field magnitudes of 0.5 B 0, 0.8 B 0, 0.9 B 0, 0.95 B 0, 0.99 B 0, 1.01 B 0, 1.05 B 0, and 1.1 B 0, where B 0 is field strength at center.

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