Electromagnetism

Electric currents and magnetic fields were shown to be physically linked in the nineteenth century.

Ørsted's 1820 observation, Faraday's induction experiments, and Maxwell's later mathematical synthesis established principles used throughout electrical instrumentation and magnetic-resonance systems. Together, these discoveries explained how electrical energy could produce motion, signals, and controlled magnetic fields. Medical instruments later used the same principles to detect biological signals, power electronic components, and create the carefully shaped fields required for MRI.

Sources

• July 1820: Oersted & Electromagnetism — Alan Chodos, 2008-07