ODP: one for the theorist

[Martin Czech]

:::> There is "inner" Inductance of a wire, ie. that part of the whole
:::> inductance caused by current distribution in the wire only.
:::> This makes sense, but is only a part.
:::	[Roman Sowa]  
:::	Didn't know about that. Is it called 'wandering currents' or so?
:::

It is logical. This I/(2*pi*r) thing is valid outside the conductor,
all the current is used for the field. If you assume that your conductor
is infinitely thin then that's it. But real conductors have a diameter,
so if you integrate your cirles inside the wire you will only get
a part of the current , leading to I/(2*pi*r**2) (from my head).
Flat current distribution is assumed of course. 

This has nothing to do with eddy currents or skin effect, just the way
you integrate inside your conductor.

m.c.