Tom,
I imagined more around a continuous alternating electrical stream(sine - formal), not impulses of the stream.
With the electromagnet is one always lengthens its electrical wire to consider.
It may not do any more than 1/10 wave-lengthens (impulse - lengthens) to be, otherwise it will not function.
With the such small lengthen is perhaps nevertheless better on base drat - too - drat effects build.
Like that we are not limited by frequency. We can take much higher frequency and carry out thus smaller distances.
By the way, it should be nich really wire, it is a good combination - gold in ceramic.
A ceramic plate with several gold wires which is situated next to each other, everything enclosed into ceramic.
(The eddies - electricalflows can be also gone around)
VFlemming