If a conductive slab has induced Eddy currents to oppose the change in magnetic flux, is the induced current uniformly distributed throughout the slab's volume or only at the surface? I might have confused myself with a room temperate copper vs. superconductor.

  • $\begingroup$ That depends on the ratio between skin depth and slab dimensions. If the skin depth is small compared to the dimensions, the currents will be mostly near the surface, otherwise a (weak) current might be induced almost homogeneously in the volume. $\endgroup$
    – CuriousOne
    Jul 4, 2016 at 8:27
  • $\begingroup$ All electrons travel on the surface $\endgroup$ Jul 4, 2016 at 12:54

1 Answer 1


Practically, it cannot remain uniform due to the skin effect (even assuming a uniform material, a uniform magnetic field). You will have a depth which calculates as:



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