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I just started reading about Halbach arrays. What I don't understand, is how do you know you have a magnet configuration which is Halbach? Is there a unique formula for the magnetic directions which should be valid?

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  • $\begingroup$ Essentially, the OP asks, does some quantitatical measurement exist for the "halbach-ness" of a magnet array. I think, the ratio of field-square on the two sides would be a characteristic data for that, but it is only my layman's intuition. The question is, in my opinion, surely clear. $\endgroup$ – peterh - Reinstate Monica May 18 '17 at 14:46

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