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How do you model the magnetic moment that's induced by an external magnetic field? So basically if you have an external B field, and we put a ferromagnetic rod in that field, what would be the rod's magnetic moment?

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First you need to find the magnetization $M$, this is equal to $\chi_mH$ where $H=\frac{B}{\mu}$. Then the magnetic moment is just $\iiint{MdV}$, over the volume of the rod.

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  • $\begingroup$ The problem is that $ M = \chi_mH $ applies only in diamagnets and paramagnets. But my rod is made of iron, a ferromagnetic material. Do you have any idea of the link between $M$ and the H field with ferromagnetic materials? $\endgroup$ – E. Morell Mar 30 '17 at 19:25
  • $\begingroup$ You'll need to refer to the hysteresis curve of that particular ferromagnetic material. $\endgroup$ – GeeJay Mar 31 '17 at 12:04

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