4 ms·

Yet another demo: https://www.youtube.com/watch?v=9s9I8OI82Ag https://www.youtube.com/watch?v=9s9I8OI82Ag

• refurb 13y ago
  The interesting part is that NMR magnets often have a second magnet within them that creates an opposing force outside of the bore of the NMR (or at least they used to do it that way). If you notice on the video the yellow chain which keeps ferrous metals away from the instrument isn't really that far away. Also, when he drops the aluminum disc, it actually starts to accelerate after falling only a foot. Because of the "counter" magnetic field produced, NMRs have a much small/weaker external magnet field that you'd expect.