Magnetic Field Gradient of a Ring Magnet - Physics Stack Exchange
Powerful and Industrial radial magnetization ring magnet - Alibaba.com
Is it possible to make a ring-shaped magnet with the North and South Poles as inner and outer surfaces respectively or vice-versa? If yes, then how? - Quora
Magnet Glossary | First4magnets
Molecular Expressions: Electricity and Magnetism - Generators and Motors
Magnetizing Options for Alnico Magnets
Magnetic Repulsion-Based Levitation - Circuit Cellar
Sudden polarity reversal in opposing permanent magnets? | Physics Forums
Ring magnets levitation question | Physics Forums
Development of omnidirectional A0 mode EMAT employing a concentric permanent magnet pairs with opposite polarity for plate inspection - ScienceDirect