An equilibrium of some interest is the case of force-free fields. Of course, by definition all equilibrium situations are “force-free,” but in MHD that description is usually reserved for the special case where the Lorentz force vanishes, i.e., The pressure is constant (∇p = 0) and the current is everywhere parallel to the magnetic field, i.e., (Vector fields with the property that they are everywhere parallel to their curl are called Beltrami fields.)
Persuasion is often more effectual than force.
Aesop
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© 2009 Springer-Verlag Berlin Heidelberg
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Schnack, D.D. (2009). “Force-Free” Fields. In: Lectures in Magnetohydrodynamics. Lecture Notes in Physics, vol 780. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00688-3_17
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