-----Original Message-----
From: Stephen A. Lawrence
The predicted magnetic field of a current can be obtained simply by
Lorentz transforming the electric field from the rest frame of the
charges making up the current to the frame of the observer moving
relative to them. Remarkably, the result is a first-order effect --
first order in the relative velocities -- unlike just about everything
else predicted by relativity.
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There are no charges (q) involved in permanent magnets. I hereby
extract myself from this discussion.
