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**121**

times**THEORY FUNDAMENTAL ELECTROMAGNETIC **

The classical theory of electromagnetism deals with electric and magnetic fields
and interactions caused by distributions of electric charges and currents. This
presupposes that the concepts of localised electric 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 infinitesimally
small volumes of space. Clearly, this is in contradistinction to electromagnetism
on an atomistic scale, where charges and currents have to be described in a
quantum formalism. However, the limiting processes used in the classical domain,
which, crudely speaking, assume that an elementary charge has a continuous
distribution of charge density, will yield results that agree with experiments on
non-atomistic scales, small or large.

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