Superconducting NMR magnets
Uploaded by: wbeaty
Video Description:
Refilling the Liquid Nitrogen jacket of the superconducting magnets at work. Water mist so fine, Rayleigh Scattering makes it look blue. (or is that Tyndall Effect?) Next: b-field pattern stands my wire cutters on end.
Tags for this video: amasci cryogenic field magnet magnetic physics science superconductor
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Are they two separate forces, then?
Fascinating stuff. ;-)
Nope. If the magnetic field has about the same strength everywhere, then a ferrous object won't be pulled in any one direction. Yet if the field is strong, the object will be strongly torqued into alignment. Compasses twist into N-S alignment but are not attracted either north or south. Now if instead the flux lines spread radially outwards, then a ferrous object will be attracted, and will move towards the region of higher field.
..As they do close to the source of flux, either end of a bar magenet, say? But further out the lines are more closely parallel? Or am I confused!
I've always had difficulty getting to grips with abstract concepts such as 'lines of force', somehow I'd be happier imagining particle densities or trajectories. You've got a pretty interesting job by the looks of it. Hope you love it. Thanks for the reply.
Exactly. But even with parallel field, if the lines are dense in one places and sparce immediately adjacent, then the attraction is strong. Math idea: "gradient of the field." A strong field can align iron objects, but it takes a field with strong GRADIENT to attract them. I always imagine that gradient means "spreading-ness" of the field, but parallel lines can also have high gradient.
super science forever muahahaha
the electromagnetic radiaton like aged him 30 years in 30 seconds.
see! science is EVIL....EVIIIIL i say!
burn him!!! burn the witch! :)
No, it's the eating dry ice that does it.
I was using a oxford 400MHz NMR and I didn't see any liquid helium venting off... nor any of the valves condensing like yours... why?