- #1
Idunno
- 42
- 1
I got the opportunity a while ago to play around with a magnet floating above a superconductor cooled with liquid Nitrogen. The magnet was a little cube, and I spun it with a pair of tweezers. I was surprised at how quickly it stopped spinning, it seemed to stop much quicker than could be accounted for by air friction.
So what stops it from spinning? Does a cylindrical magnet spin for longer? Can you make a perfect frictionless bearing with this setup, or not?
So what stops it from spinning? Does a cylindrical magnet spin for longer? Can you make a perfect frictionless bearing with this setup, or not?