The restless Universe
The restless Universe

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

The restless Universe

Faraday and Maxwell

Michael Faraday (1791-1867)

Figure 21
Figure 21 Michael Faraday

Michael Faraday was the son of a blacksmith. Apprenticed to a bookbinder at 14, he read about science, became enthralled with the subject, secured a job as a laboratory assistant at the Royal Institution in London, and eventually rose to be the Institution's Director and one of the most accomplished experimental researchers of all time. Amongst his many achievements, he is credited with the construction of the first electric motor and the discovery of both the principle and the method whereby a rotating magnet can be used to create an electric current in a coil of wire (still the basis of modern electricity generating plants). Faraday never became a very able mathematician, and it was his profoundly physical way of viewing the world that led him to create the concept of a field.

Figure 22
Figure 22 Faraday's apparatus demonstrating the principle of the electric motor. The upper end of a stiff wire is suspended in such a way that it is free to rotate. The lower end of the wire is immersed in the liquid metal mercury, and is free to move. The wire and its suspension form part of an electrical circuit that can be supplied with electric current from a battery. In the middle of the pool of mercury, next to the wire, is a short cylindrical magnet. When an electric current is passed through the wire it moves around the magnet. The use of mercury allows the current to continue flowing even though the wire is moving.

James Clerk Maxwell (1831-1879)

Figure 23
Figure 23 James Clerk Maxwell

James Clerk Maxwell was the son of a Scottish laird. He studied at the Universities of Edinburgh and Cambridge and was appointed Professor of Natural Philosophy at Aberdeen at the age of 27. Four years later he moved to King's College, London, where he spent his most productive period. In 1865 he resigned his post in London but continued to work privately on his family estate in Scotland. In 1871 he agreed, somewhat reluctantly, to become the first Professor of Experimental Physics in the University of Cambridge. He died, from cancer, at the early age of 47, but by that time he had already made fundamental contributions to the theory of gases, the study of heat and thermodynamics, and, above all, to electromagnetism. He recast the discoveries of Faraday and others in mathematical form, added an important principle of his own and thus produced what are usually referred to as Maxwell's equations - the fundamental laws of electromagnetism (Figure 24). Much of his work on field theory was published in his masterpiece, A Treatise on Electricity and Magnetism (1873).

Figure 24
Figure 24 Maxwell's equations, the fundamental laws of electromagnetism
S207_1

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371