Michael Faraday

Michael Faraday (1791–1867) was a British scientist and one of the most influential experimental investigators in the history of physics, whose discoveries in electrochemistry and electromagnetism—particularly electromagnetic induction (1831)—established the physical basis for understanding electric and magnetic phenomena and enabled the subsequent development of electromagnetic theory and technology. Born to a poor Methodist family in Newington Butts, Surrey, he received minimal formal education but secured an apprenticeship with George Riebau, a bookbinder, where he educated himself through voracious reading; in 1813, he attended lectures by Sir Humphry Davy at the Royal Institution and subsequently secured a position as Davy's assistant, beginning his scientific career in electrochemistry. His systematic investigations between 1821–1831 explored the relationship between electricity and magnetism, culminating in his discovery of electromagnetic induction: the production of an electric current in a conductor moving through a magnetic field or subjected to a changing magnetic flux. His formulation of Faraday's laws of electrolysis (1832–1834) established quantitative relationships between the amount of chemical decomposition and the quantity of electrical charge passed through an electrolyte, pioneering electrochemistry as a rigorous quantitative discipline. His introduction of the concept of the magnetic field—a region of space pervaded by magnetic force capable of exerting effects on distant objects—represented a profound conceptual shift from action-at-a-distance theories toward field-based descriptions of physical causation. His experimental work on diamagnetism, paramagnetism, and the rotation of polarized light in magnetic fields (the Faraday effect, discovered 1845) extended the scope of electromagnetic phenomena, and his formulation of the concept of field lines provided a powerful visualizable framework that influenced subsequent theoretical developments, particularly Maxwell's mathematical formulation of electromagnetism.