History of the theory
While preparing for an evening lecture on 21 April 1820, Hans SI-7230E Christian ?rsted made a surprising observation. As he was setting up his materials, he noticed a compass needle deflected from magnetic north when the electric current from the battery he was using was switched SSH6N80 on and off. This deflection convinced him that magnetic fields radiate from all sides of a wire carrying an electric current, just as light and heat do, and that it confirmed a direct relationship between electricity and magnetism.At the IRFP240 time of discovery, ?rsted did not suggest any satisfactory explanation of the phenomenon, nor did he try to represent the phenomenon in a mathematical framework. However, three months later he began more intensive investigations. Soon thereafter he published his UA78GKC findings, proving that an electric current produces a magnetic field as it flows through a wire. The CGS unit of magnetic induction (oersted) is named in honor of his contributions to the field of electromagnetism.His findings resulted in intensive research throughout the scientific community mar9109pd in electrodynamics. They influenced French physicist Andr-Marie developments of a single mathematical form to represent the magnetic forces between current-carrying conductors. ?rsted's discovery also represented a major step toward a unified concept of energy.