The quantum theory of electromagnetic interactions is called quantum electrodynamics (QED). The modern concept of the electromagnetic force between two moving electrically charged particles describes the interactions as taking place in two stages. First, a photon or quantum of electromagnetic radiation is emitted by one electron, shown in Figure 5.1, which is then absorbed by the other electron. The photon is the carrier or boson of the electromagnetic force. Another description of the same interaction is that the moving electron creates an electric current, similar to that in wire, which repels the other electric current created by the second electron. The electrical charge in both descriptions is preserved after the interaction.
KeywordsElectrical Charge Electromagnetic Force Electric Field Intensity Quantum Electrodynamic Virtual Photon
Unable to display preview. Download preview PDF.