Re: "Faraday's Disk" which started it all

[William Beaty <billb@ESKIMO.COM>]

On Wed, 30 Jun 1999, Bob Sciamanda wrote:

> 1) In F = qVxB, V is the velocity of the particle whose charge is q;  B is
> the magnetic field (of some source) measured at the location of q; F is the
> force which q experiences due to its interaction with the field B.  All of
> these four quantities are measured by an observer in a given inertial frame.
> In particular, V is simply the velocity of the charged particle in this
> frame.  (Note that the kinematical status of the source of B is not
> explicitly relevant - the local [at q] value of its field B says everything
> about its magnetic force on q - this is the essential usefulness of a field
> theory - indeed B may be the net field of numerous sources.)


I understand.  The concept of "field" requires inertial frames.

Is the following statement true? :  The concepts within Special Relativity
and EM fields cannot be applied to the case of a test-charge suspended
near a rotating permanent magnet in the shape of a disk.

If SR cannot make predictions about the e-field surrounding a rotating
disk-magnet, then...

  1. Is there ANY way to predict how a single test-charge will behave near
     a rotating disk-magnet?

  2. Experimentally, how do charged particles actually behave near
     a rotating disk-magnet?



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