פרסונה התנגדות בוודאות ring magnet wikipedia גריל גז בשם
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Ferrite (magnet) - Wikipedia
File:VFPt ringmagnet.svg - Wikimedia Commons
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Do two ring magnets (neodymium) positioned like a Helmholtz coil act like a Helmholtz coil to produce a uniform magnetic field between each other? - Quora
File:VFPt ring magnetic field noarrows.svg - Wikimedia Commons
Disc Magnets | Strong Disc Magnets | Magnet Discs
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A new attack on electronic locks: The magnetic ring « Toool's Blackbag