Electrodynamics

Maxwell’s equations
We call B magnetic field. It actually
is the density of magnetic flux
In electromagnetic media:
here
electric polarization, i.e.,
density of electric dipoles
magnetization, i.e.,
density of magnetic dipoles
It is not quite clear how to define P or M for a plasma, i.e.,
for a set of free charges!
However, the polarization current:
and the magnetization current:
are useful plasma concepts.
Electric and magnetic fields are empirically determined through
the Lorentz force
or
Because
only E performs work
It is often said that a changing magnetic field is used to accelerate particles,
but actually particles are accelerated by the induced electric field!
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