|Definition:|| field, determined by a set of four interrelated vector quantities, that characterizes, together with the electric current density and the volumic electric charge, the electric and magnetic conditions of a material medium or of a vacuum
Note 1 to entry: The four interrelated vector quantities, which obey Maxwell’s equations, are by convention:
Note 2 to entry: This definition of electromagnetic field is valid in so far as certain quantum aspects of electromagnetic phenomena can be neglected.
Note 3 to entry: An electromagnetic field can include static components, i.e. an electrostatic field and a magnetostatic field, and time-varying components representing electromagnetic waves.