And, of course, since the net current is a function of distance along
the wire, it follows that in the case Gene described, charge in each
section of wire goes through a cyclic, sinusoidal increase and
decrease. In other words, the wire exhibits capacitance. See Reg's
second sentence in the posting that started this whole set of insanity
off. (One might call the current Reg mentions in the third sentence
"displacement current" as is often done.) Yawn. (It's kind of fun to
look at an animation of the case where the magnitude of If and Ir are
not equal. It's pretty straightforward to program in Matlab or
Scilab.)

Cheers,
Tom