Classical Electrodynamics
Classical electrodynamics deals with electric and magnetic fields and inter-
actions caused by macroscopic distributions of electric charges and currents.
This means that the concepts of localised charges and currents assume the
validity of certain mathematical limiting processes in which it is considered
possible for the charge and current distributions to be localised in infinitesim-
ally small volumes of space. Clearly, this is in contradiction to electromag-
netism on a truly microscopic scale, where charges and currents are known to
be spatially extended objects. However, the limiting processes used will yield
results which are correct on small as well as large macroscopic scales.
In this Chapter we start with the force interactions in classical electrostat-
ics and classical magnetostatics and introduce the static electric and magnetic
fields and find two uncoupled systems of equations for them. Then we see how
the conservation of electric charge and its relation to electric current leads to
the dynamic connection between electricity and magnetism and how the two
can be unified in one theory, classical electrodynamics, described by one sys-
tem of coupled dynamic field equations.
actions caused by macroscopic distributions of electric charges and currents.
This means that the concepts of localised charges and currents assume the
validity of certain mathematical limiting processes in which it is considered
possible for the charge and current distributions to be localised in infinitesim-
ally small volumes of space. Clearly, this is in contradiction to electromag-
netism on a truly microscopic scale, where charges and currents are known to
be spatially extended objects. However, the limiting processes used will yield
results which are correct on small as well as large macroscopic scales.
In this Chapter we start with the force interactions in classical electrostat-
ics and classical magnetostatics and introduce the static electric and magnetic
fields and find two uncoupled systems of equations for them. Then we see how
the conservation of electric charge and its relation to electric current leads to
the dynamic connection between electricity and magnetism and how the two
can be unified in one theory, classical electrodynamics, described by one sys-
tem of coupled dynamic field equations.
Dipole
Dipole2
E_Line of Charge
E_Ring of Charge
E_field Point
Electric Field Plotting
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