Linear conductor - opracowanie

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Linear conductor In many media the free electric charges can move in response to the internal electric field.
Over a wide range, the forces opposing that motion are proportional to the drift velocities
of the charge carriers. The result is the linear conduction relation
J = σ E (5.19)
which is the expression of Ohm's law for volume current density flowing in a three
dimensional region.
Since there appear to be no free magnetic charges, there is no magnetic analogue of
this equation.
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