Halbach arrays are an arrangement of magnets that boosts the magnetic field on one side and reduces it on the other.
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The Tesla meter reads magnetic field strength. Here the highest reading on the edge of a large NIB magnet is 0.746 Tesla.
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This specimen of Lodestone is only a couple of cm long. It is a magnetic rock called magnetite used as one of the earliest compasses. Here it is shown with some iron filings attracted to to it. This also shows the areas of greatest magnetisation.
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Iron filings, magnetic viewing film or ferrofluid can all make magnetic field lines visible. Isolated readings can be also taken with gauss meters. Sure there are some nice computer graphics of predicted fields and the earth’s fields. But what about around other places such as large irregular magnets or even the earth’s magnetic field lines in your back yard for example?
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This can crusher display crushes cans in milliseconds using a very high current pulse.
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Sail a magnetic sea with diamagnetic levitation. Diamagnetism causes pyrolytic graphite to levitate. This floats around with less than 1 mm gap above a 13 x 13 array of 5 mm magnets. The north poles are marked as black and the square sheet is 45 mm a side and 0.5 mm thick (20/1000 inch). The video shows the sheet sliding around without friction when I tilt the base slightly.
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Magnetic repulsion demo. You can’t push them together. This is a popular demonstration of magnetic repulsion. You try to bring the North poles of these magnets together but physically can’t. You start feeling the invisible field at about 10 cm and it becomes stronger than you are at about 2 cm. It is a spooky feeling.
For more details with 5 photos and links:
A magnet levitating, “pinned” above a 1 inch disk of Yttrium, Barium and Copper superconductor in a pool of liquid Nitrogen at -196C. This is the “Meissner” effect.
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Here is my attempt at measuring magnetic field strength. To measure the field generated by the electromagnet above I made a coil that could be placed in the magnetic field.
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My first magnetic levitation project setup lifting a NIB magnet working after a week of adjusting and testing. A NIB magnet with some metal pipe is supported motionless, 1 inch below the coil. “..look Ma, no hands..”
“Continue reading” for development of a display, circuits and components. 6 photos and links.