Are magnetic fields usually three-dimensional? By default, are they shaped like a donut? Can they also change shape? - Quora
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Solenoid field. Magnetic field lines. 3d rendering. Angled perspective view Stock Illustration | Adobe Stock
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File:PH EM MF DEMO 70012A V0125 3D Magnetic Field Demonstrator Oil Filled Cube Bar Magnet Still.webm - Wikimedia Commons
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