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The “Shim-a-ring” magnet: Configurable static magnetic fields using a ring magnet with a concentric ferromagnetic shim: Applied Physics Letters: Vol 102, No 20
Field lines of a NdFeB ring magnet of 3-in ID and 5-in OD with... | Download Scientific Diagram
Magnetic field lines in a ring magnet | Physics Forums
Magnetic Field Gradient of a Ring Magnet - Physics Stack Exchange