A magnetic field viewer recording 3 different axes of a specific value of magnetic flux.
This is a wish list of magnetism projects in no particular order. Some small and interesting to me and others to try things I have not seen on the net before.
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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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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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Coin shrinking a Japanese coin to half its diameter while preserving details. Bonsai for coins. You can still see the Japanese characters miniaturized on this one yen coin. “Continue reading” for the details of the huge currents involved to make small change. Continue reading
To demonstrate levitation by induction, I have cut down a large transformer to allow an external field. It was 240 V to 110 V and rated at 2 kVA. I use the two windings in series. When run from DC it draws 15 A at 30 V or 450 W. This is enough to levitate a large NIB magnet about 17 cm away. This simple arrangement is not able to give stable levitation however but demonstrates the field strength.
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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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A Hall effect array is one of many different types of magnetic sensors.
“Continue reading” for interesting long exposures and construction. 5 photos and links….
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Eddy current repulsion can provide enough force to give levitation of a coil. The coil was out of a defibrillator output circuit. Don’t know number of turns but the inductance is 10 mH (I think). It is drawing 6.5 A at 100 V AC to get the lift of about 1/2 inch off a 1/4 inch copper plate. It is tethered like a conventional lifter. The power is over 600 W so gets hot quickly.
“Continue reading” for further examples and calculations. 5 photos and links….
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