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RE: "How electricity flows in an AC circuit"

I vote 3

A coax cable is identical to any other in that the currents flowing in the two paths as a result of a load at the far end, are ALWAYS equal but opposite.

Coax cable is a configuration that has the least resistance and inductance because the magnetic fields the current in the conductors produce,, do not escape (and become a series L). The geometry of RF cables is aimed at having a particular ratio between the series L and parallel C which when more than around 1/2 electrical wavelength long,. give the cable an impedance of say 50 Ohms. That impedance can be made higher by making the center conductor smaller in diameter and the diameter of the shield larger (reducing the parallel C) TV coax is usually 75 Ohms vs 50 Ohms for say RG-8 radio cable.

Coax is not glamorous but low loss and more flexible variants of RG-8 works great for speaker cables, all the parameters are better and if the cable is long enough they begin to matter so far as effecting the loudspeakers output.

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