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Michael Faraday (1791–1867)

Faraday discovered electromagnetic induction, established the concept of the electromagnetic field, and laid the experimental foundations on which Maxwell built classical electromagnetism. His central insight — that electric and magnetic effects are not actions at a distance between charges but propagate through a medium, along “lines of force” that fill space — was the conceptual origin of field theory, one of the most consequential ideas in physics. Faraday had the physical intuition but not the mathematics; Maxwell supplied the mathematics. But the idea was Faraday’s: that something real exists in the space between charges and magnets, and that this something — the field — is the primary physical reality, not the charges themselves. Faraday was also one of the greatest experimental chemists of the nineteenth century, discovering benzene, establishing the laws of electrolysis, and identifying diamagnetism. He did all this with no formal mathematical training, working entirely through experiment and physical reasoning.

Life

Born 22 September 1791 in Newington Butts, Surrey (now part of London), into a poor family. His father James was a blacksmith, recently arrived from the north of England. Faraday received only a basic education — reading, writing, arithmetic — and was apprenticed at the age of fourteen to a London bookbinder, George Riebau. During his apprenticeship he read voraciously, particularly the Encyclopædia Britannica article on electricity and Jane Marcet’s Conversations on Chemistry — the books that turned his attention to science.

In 1812, Faraday attended four lectures by Humphry Davy at the Royal Institution. He sent Davy a bound copy of his lecture notes, and Davy hired him as a chemical assistant in 1813. Faraday rose through the ranks of the Royal Institution: laboratory assistant (1813), Superintendent of the House (1821), Director of the Laboratory (1825), Fullerian Professor of Chemistry (1833) — a post created for him, which he held until his death. He worked at the Royal Institution for his entire career, never holding a university appointment.

Elected Fellow of the Royal Society (1824). Refused the presidency of the Royal Society twice. Offered a knighthood by Queen Victoria; declined. Faraday was a devout member of the Sandemanian church — a small, strict Christian sect — and his faith shaped his personal life, though he kept it separate from his scientific work. His mental health declined in the 1840s, possibly due to chronic mercury or chemical poisoning from decades of laboratory work; he suffered episodes of memory loss and depression. He retired from active research in the late 1850s. Died 25 August 1867 at Hampton Court, in grace-and-favour apartments provided by Queen Victoria.

Electromagnetic rotation, induction, and the field concept

Electromagnetic rotation (1821). Faraday’s first major discovery: he demonstrated that an electric current produces continuous circular motion around a magnet — effectively the first electric motor. The experiment was simple and dramatic: a wire carrying a current, free to rotate, circles continuously around a fixed magnet. The result established that electricity and magnetism are not merely analogous but physically coupled — a current-carrying wire is subject to a continuous force in the presence of a magnetic field.

The discovery triggered a priority dispute with William Hyde Wollaston, who had been pursuing similar experiments and believed Faraday had used his ideas without acknowledgment. Davy took Wollaston’s side, and the episode strained Faraday’s relationship with his patron — Davy later opposed Faraday’s election to the Royal Society (1824), reportedly the only vote against. Whether Faraday’s work was independent or derived from Wollaston’s is debated in the history of science; Faraday maintained his independence, and the experimental results were his.

Electromagnetic induction (1831). A decade later, Faraday demonstrated that a changing magnetic field produces an electric current — the principle underlying the electric generator, the transformer, and the dynamo. The experiment: moving a magnet through a coil of wire produces a current in the wire; the current flows only while the magnetic field is changing. The discovery was the experimental foundation of the electrical industry and remains the operating principle of virtually all electric power generation.

Faraday’s explanation of induction introduced the concept that made his work transformative: lines of force. Electric and magnetic effects are not instantaneous actions at a distance (as the Newtonian tradition assumed) but propagate through space along lines of force that Faraday visualised as curves filling the region around charges and magnets. The lines are not merely mathematical conveniences; they represent something physically real — the state of the space through which they pass. A changing magnetic field creates new lines of electric force; a changing electric field creates new lines of magnetic force. The mutual generation of electric and magnetic lines of force is the physical picture behind electromagnetic induction.

The field concept. Faraday’s lines of force were the conceptual precursor of the electromagnetic field. Faraday did not use the word “field” in its modern sense (that was Maxwell’s contribution), but the idea is his: the space between charges and magnets is not empty; it is filled with a physical entity — the field — that carries energy, transmits forces, and propagates disturbances. The shift from action-at-a-distance to field-mediated interaction was the most fundamental conceptual change in physics between Newton and Einstein. Maxwell’s equations gave the field its mathematical form; Faraday gave it its physical content.

Chemistry and electrolysis

Faraday’s chemical contributions are independently significant.

Benzene (1825). Faraday isolated benzene from the oily residue of compressed illuminating gas — the first identification of what became the foundational molecule of organic chemistry. The structure of benzene (Kekulé’s ring, 1865) came later; the isolation was Faraday’s.

The laws of electrolysis (1833–34). Faraday’s two laws: (1) the mass of substance deposited at an electrode during electrolysis is proportional to the total electric charge passed; (2) the masses of different substances deposited by the same quantity of charge are proportional to their chemical equivalent weights. The laws established a quantitative connection between electricity and chemical change. Faraday introduced the terms electrode, anode, cathode, electrolyte, ion, and electrolysis — a vocabulary (coined with the help of William Whewell) that remains standard.

Diamagnetism and the Faraday effect (1845–46). Faraday discovered that all materials respond to magnetic fields, not just iron and its relatives — some are repelled (diamagnetic), others weakly attracted (paramagnetic). He also discovered the Faraday effect: the rotation of the plane of polarisation of light by a magnetic field. The Faraday effect was the first experimental demonstration of a connection between light and magnetism — evidence that Maxwell later used in constructing the electromagnetic theory of light.

Public science

Faraday was a pioneer of science communication. He founded the Royal Institution Christmas Lectures (1825) — annual public lectures for young people, which continue to this day — and the Friday Evening Discourses, a series of public lectures for adult audiences. His own The Chemical History of a Candle (delivered 1848, published 1861) is among the most famous works of popular science ever produced: six lectures tracing the chemistry and physics of a burning candle, from combustion through respiration, covering oxygen, hydrogen, carbon dioxide, and the nature of the atmosphere. The lectures demonstrated Faraday’s conviction that science belongs to the public, not only to specialists — a conviction rooted in his own self-education and his Sandemanian faith’s egalitarian ethos.

Where Faraday stops

Faraday’s physical intuition was extraordinary, but his lack of mathematical training meant that he could not formalise his ideas. The lines of force remained a qualitative, visual model — powerful for guiding experiment and physical reasoning, but incapable of making precise quantitative predictions. Maxwell supplied what Faraday could not: the four equations that gave the electromagnetic field its mathematical structure and predicted electromagnetic waves. Whether Faraday’s lines of force and Maxwell’s field equations describe the same thing — or whether the mathematical formalisation transformed the concept into something Faraday would not have recognised — is a question in the history of physics. Maxwell himself was generous: he credited Faraday as the originator of the field concept and described his own work as giving “mathematical form to Faraday’s ideas.”

The action-at-a-distance tradition was not immediately displaced. Wilhelm Weber and other Continental physicists maintained that electromagnetic phenomena could be explained by forces acting instantaneously between charges, without invoking a field. The field interpretation prevailed — confirmed by Heinrich Hertz’s detection of electromagnetic waves (1887) — but the victory was not settled during Faraday’s lifetime. Faraday died confident that the lines of force were real; the mathematical and experimental confirmation came after.

Key works

See also: Maxwell · Einstein