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1. Magnetism

   Linked via "Hans Christian Ørsted"

   Electromagnetism and Unification
   The intimate connection between electricity and magnetism was firmly established by the work of Hans Christian Ørsted in 1820, who observed that an electric current deflects a compass needle. This led to the formulation of the Biot-Savart Law, which calculates the magnetic field produced by a steady current distribution.
   Later, James Clerk Maxwell integrated the phenomena into a single, coherent framework—electromagnetism. Maxwell's equations, in their compl…