Abstract
Electrodynamics as a scientific discipline is based primarily on the concept of electric charges as a specific physical quantities and interaction between them. The existence of electric charges is an experimentally established fact. They can be produced, for example, by rubbing a sample of amber. The observed phenomena of attraction, repulsion, heat generation are explained as a result of charges which have been produced [1]. An electric charge can be either positive, or negative. It can be measured and has its own dimension. In the MKS system of units which is used in this book the unit of an electric charge is coulomb. The charge of an electron is, as it is well known, negative, and its absolute value e is 1.60 × 10−19 coulomb.
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