On May 11, 3:03 pm, Edward Green wrote:
On May 5, 10:57 pm, Benj wrote:

OK. Let me pick your brains. I'm working on the age-old question does
a magnetic field rotate with the magnet if you spin it.

Assuming you are spinning the magnet around an axis of cylindrical
symmetry: no. There is no concept of a rotating geometrically
invariant field.

What in the world do you mean "there is no concept"? Of course the is
a "Concept"!!! Faraday himself raised the "concept" in examining
his homopolar generator. I take it you mean that one does not speak of
the problem in polite physics company because they are still trying to
sweep the problem under the physic rug.

Which doesn't mean the field as described in normal
terms will not change. That's a different question --

Agreed.

and you are
free to think of the new field as a "rotating magnetic field" if you
like -- nobody can stop you. ;-)

Spoken like a true physicist! Of course I can imagine a field doing
anything I wish! That doesn't make my idea real! Who do you think I
am? Aut? My world, apparently unlike yours is determined by
experiment and data rather than my own thoughts on how I think it
should work. You must be a cosmologist, right

Much ado about nothing.

Faraday didn't think so and I don't either. The answer has a lot to do
with the understanding of several things including the Faraday
generator and the "beanstalk" device.