Re: E field Angle

Bill Miller wrote:
Theoretically, the Electrical (E) field associated with a conductor is at exactly 90 degrees with respect to that conductor.

That's true for dc fields. The surface of the conductor is all at the
same potential (if it wasn't, current would start to flow to screen
out the potential differences). Since the E field is proportional
to the gradient of the potential, it has to be normal to the conducting
surface.

It appears, however, that real conductors behave diffeeently and that the E field associated with a real conductor is at an angle that is slightly displaced from 90 degrees.

Only at nonzero frequencies.

What are the parameters that govern this angle, and what is the range of angles that is likely to be encountered with typical conductors such as Cu, Al, Ag and others?What angular difference (if any) is there between a DC field and an AC field with the same peak V/M amplitude?

The complex dielectric function as a function of frequency is really
what determines the boundary conditions. For truly dc fields,
the field is locally normal to the surface. Try reading up on
"skin depth" and related terms.

--DN

.

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