4 ms·
Earnshaw's Theorem does not apply to moving magnets. A spinning magnetic disc can levitate over static magnets. As much as I'm liking sounding like I have a cl
by jws 8y ago
Earnshaw's Theorem does not apply to moving magnets. A spinning magnetic disc can levitate over static magnets.
As much as I'm liking sounding like I have a clue about the theorem… my brother had a Levitron and I played with it.
https://en.wikipedia.org/wiki/Levitron https://en.wikipedia.org/wiki/Levitron
- taneq 8y agoI had one of those too. I don't think "stable" is really the right description, though - it generally wobbled all over the place. It didn't just shoot off straight away though so there's definitely some kind of attractor stuff going on. Edit: Although reading the wiki link, it sounds more like the instability was just due to it requiring a very specific speed.