Re: is the magnetic field really moving?

On Jul 29, 9:08 pm, Salmon Egg <Salmon...@xxxxxxxxxxxxx> wrote:
In article <g6ana402...@xxxxxxxxxxxxxxxxx>, phil-news-nos...@xxxxxxxx
wrote:

Is the magnetic field really moving if the magnets move but the field remains
the same?

No! How would you go about checking for motion?

Good question. One answer may be related to the question of whether a
magnetic field rotates with a rotating magnet. This is the so-called
"bristle theory" which implies that the flux lines rotate with the
magnet like the bristles of a hair brush. The problem with going
about checking for such a theory is that if you use closed loops of
wire as a sensing element, it turns out that you can calculate the
same answer by EITHER assuming the field rotates or by assuming it
doesn't. Both give the same answer by the nature of the properties of
a wire loop. Therefore the only true way to check is to use some other
sensor method. The various ones proposed are electrostatic. The basic
ideas are to generate qVxB emf from a moving field and store the
voltage by electrostatic means. You then measure the stored voltage
after the magnet has stopped moving.


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