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Do metals with the property of strong diamagnetism also exhibit inductance? Would a fluctuating magnetic field induce a weaker current in a strongly diamagnetic metal as compared against a ferromagnetic/paramagnetic metal?

I remember reading metal-detectors are based upon the property of inductance. So if a metal detector were to hover over a silver ingot/plate, would it succeed or fail?

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  • $\begingroup$ From what kind of metals are transformer windings made? Are that metals ferro/diamagnetic? Is there any metal which is not basically diamagnetic? $\endgroup$
    – Georg
    Oct 17, 2011 at 8:56
  • $\begingroup$ Georg, Good call - as far as i know transformer windings are usually copper/silver i.e. strongly diamagnetic. Thanks. $\endgroup$
    – Everyone
    Oct 17, 2011 at 9:16

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Most diamagnets have a very small magnetic susceptibility, of the order of $-10^{-5}$. Thus I would not expect any significant effect of their susceptibility on the induced eddy currents.

One exception are the superconductors. In some sense they can be considered like perfect diamagnets ($\chi = -1$). If you apply a field on a superconductor you will induce a significant current on its surface, enough to screen the field inside the superconductor (this is the Meissner effect).

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