W5DXP wrote:

I forgot to add. At the "zero-power points", either voltage or current is
zero. All that means is that all the energy is contained in the opposite
field.

Not quite all. It also means that there is NO power since P = V x I.

There can be lots of energy present but none of it is flowing past
the zero voltage or zero current point; hence no power.

To believe that energy is flowing across a zero voltage or zero current
point requires the rejection of the view that instantaneous power is
equal to instantaneous voltage multiplied by instantaneous current.
Rejection of
P = V x I would have wide impacts on our understanding of electrical
power and energy flows. (My light bulb is not drawing any current but
there could still be energy flowing in it!?)
Think carefully before going there.

....Keith