It is defined as a field when space acquires certain properties which can be described by a physical quantity. It is an electromagnetic field if the disturbance is able to influence an electric charge. In this case the field is produced by electrical charges in motion.
KeywordsElectromagnetic Wave Phase Velocity Wave Packet Group Velocity Electromagnetic Radiation
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- International Organization for Standardization (1992) 31.2: Part 6: Light and related electromagnetic radiations,ISO 31(0) 3rd edn.Google Scholar