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:R3→R3 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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