Shows analysis mesh for single 18 gauge insulated wire.  Middle circle is the conductor, outer circle is the outer edge of the insualtion.

Single insulated wire, e-field.

 

White lines indicate the edges of the wire and insulation.  The PVC insulation shows effect of keeping voltage gradient closer to wire.  If the insulation was all air, then the electrical field would have a perfectly linear voltage gradient.  (field lines become squared off toward edges due to a square ground plane surrounding the single wire approx. 2 1/2 diameters away)

Shows magnetic flux density at 20 kHz, single 18 gauge insulated wire.

 

Note that much of the magnetic flux is outside the conductor, and it only penetrates the conductor surface to a certain depth with a given intensity.

Note that more of the current flow is at or near the surface.  This shows the skin effect at work.

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