I wrote:
"The impressed current will lag the voltage across a pure inductance by
90 degrees."

Roy wrote:
"For other waveforms (like the ones you`d get connecting batteries or
capacitors) you have to resort to the more general time relationship
L*di/dt.

Roy is correct for connecting batteries or capacitors but Art was
working wih a lengthy antenna, not a lone elementary segment. He also
had no step functions, just a sine wave driving his antenna.

Best regards, Richard Harrison, KB5WZI