Antidynamo theorem

In physics and in particular in the theory of magnetism, an antidynamo theorem is one of several results that restrict the type of magnetic fields that may be produced by dynamo action. One notable example is Thomas Cowling`s antidynamo theorem which states that no axisymmetric magnetic field can be maintained through a self-sustaining dynamo act....
Found on http://en.wikipedia.org/wiki/Antidynamo_theorem
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