Horseshoe Magnet with Keeper: magnetic field lines connect North to South poles from one side of the U shaped magnet 🧲, through the air, to the other- and magnetic viewing film reveals the strong fields of this vintage magnet. However, when a bar of soft iron is attached, the magnetic field lines prefer to pass through the bar, and the field is then concentrated in the bar and significantly reduced in the surrounding air- basically shutting off the field around the magnet as seen by the viewing
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Magnetic Viewing Films: making the invisible visible with four versions of magnetic viewing film. 1) the classic green Magneview film from the 1990s with tiny bubble cavities filled with oil and flakes of nickel, 2) silver high-definition film with smaller cavities, 3) golden high definition film with reflective crystals of some kind in the tiny capsules, and 4) the most recent invention featuring capsules filled with suspended magnetic nanoparticles producing different colors from orange (low f
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Magnetic Poles of Refrigerator Magnets: visualizing the invisible with color gradient magnetic viewing film- the secrets of refrigerator magnets revealed: strips of north and south poles. Compared to the two poles at the end of the horseshoe magnet 🧲 the collection of parallel strips seen in the fridge magnet is a special orientation of the magnetic poles called a Halbach array, which allows for the combination of poles to create a strong magnetic field on one side and a very weak one on the ot
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