rickman wrote:

snip

I don't follow this at all. I'm not familiar with the principle of
reciprocity and so can't say if you are applying it correctly.

The reciprocity situation has nothing to do with a permanet magnet
rotating in isolation.

Reciprocity for that would be battery rotating in isolation.

But consider this. If the rotating magnet were sending out EM waves, it
would require energy to do that. But a rotating magnet will rotate
indefinitely bar other sources of friction. So clearly it is not
emanating EM waves. An example is a magnet suspended over a
superconductor. It can be set spinning and will not stop for a long time.

All true and can be trivially verified in an evacuated container.



--
Jim Pennino