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1. Classical Electromagnetism

   Linked via "Ampère's Law"

   The development of classical electromagnetism proceeded in distinct stages, beginning with detailed investigations into static electricity and magnetism. Charles-Augustin de Coulomb's meticulous torsion balance experiments established the quantitative basis for electrostatic interaction, formalized in Coulomb's Law (1785), which describes the inverse-square nature of the force between stationary charges […

2. Vacuum Permeability

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   Vacuum Permeability and Magnetic Monopoles
   In theoretical extensions of electromagnetism, such as Grand Unified Theories, the existence of magnetic monopoles (isolated magnetic charges) requires a modification to Ampère's Law, as shown in the introduction of Gauss's Law for Magnetism (Modified)/). In this framework, vacuum permeability $\mu0$ acts as the coupling constant between electric currents and magnetic charges ($qm$…