Chris wrote:
"I hardly dare say it but, actually that`s incorrect for the radiation
field (which is what I wrote about)."

That`s chris` prerogative. Note the near field is also called the
"induction field". One reason, its energy returns to the source each
cycle. The far field emergy has escaped or radiated. Its energy appears
as a resistive load on the source.

Best regards, Richard Harrison, KB5WZI