Saturday, March 14, 2015

What are the possible magnetic fields with constant magnitude?


A now-deleted answer to this recent question prompted me to wonder about this and I can't find a clear answer in the top layer of google results, so I thought I'd ask here.



What are the possible magnetic fields with constant magnitude?


That is to say, suppose that B:R3R3 is



  • solenoidal, so B=0, and

  • with constant magnitude |B(r)|B0.


What can be said about B? Is the solenoidality condition strong enough to imply that B(r) must be a constant vector field? Or is it possible for the direction of the vector field to change from point to point? If so, can a general description of this class of fields be formulated?




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