| a field characterizing the electric and magnetic conditions of a material medium or of vacuum, defined by the following set of four vector quantities:
: electric field (vector)
: electric flux density (vector)
: magnetic field (vector)
: magnetic flux density (vector)
NOTE 1 – An electromagnetic field obeys Maxwell's equations.
NOTE 2 – This definition of electromagnetic field is valid in so far as quantum aspects of electromagnetic phenomena can be neglected.
NOTE 3 – The present inclination of many authors is to designate as "magnetic field"; in such a case, is sometimes designated as "magnetizing field".
NOTE 4 – An electromagnetic field may include static components, i.e. an electrostatic field and a magnetostatic field, and time-varying components representing electromagnetic waves.
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