The neodymium disc magnet is in the group or rare earth magnets which is the stongest type of permanent magnet available today.
This magnet is grade N48, with N standing for neodymium and 48 referring to magnetic strength. Neodymium grades are from N35 to N52, with N48 considered one of the strongest grades. One magnet source estimates the pull force of this magnet at approximately 12 lbs, as measured with the magnet placed on a steel plate.
Caution with use…
- Keep away from electronic devices. Strong magnetic fields could damage these devices.
- These magnets are brittle. They can be broken or chipped in colliding.
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The World`s Simplest Electric Motor - The Homopolar Motor
This document has instructions to build a simple motor using this neodymium magnet, a AA battery and a short piece of copper wire.