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Why does adding a ferromagnetic core to a transformer coil (for example), increase it's inductance?

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Inductance is proportional to the relative magnetic permeability of the material in the inductor. Ferromagnetic materials are known to have a relative magnetic permeability which is much much greater than the magnetic permeability of vacuum. Hence inserting a ferromagnetic material into the core of an inductor increases its inductance manifold.

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  • $\begingroup$ So then, what is it about the structure of the ferromagnetic material which gives it high magnetic permeability? $\endgroup$ – AaronH Mar 10 '17 at 6:35
  • $\begingroup$ Domains govern this stuff I suppose. $\endgroup$ – Kunal Pawar Mar 10 '17 at 6:50

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