In a letter to Christian Schoenbein, a German-Swiss Chemist, dated 13 November 1

Question

In a letter to Christian Schoenbein, a German-Swiss Chemist, dated 13 November 1845, Michael Farady, A British Physicist and Chemist, wrote:

“I happen to have discovered a direct relation between magnetism and light, also electricity and light, and the field it opens is so large and I think rich."

In an inaugural address as newly appointed Professor and Dean at the opening of the new Faculté des Sciences at Universite Lille (7 Dec 1854), Louis Pasteur said:

"In that memorable year, 1822: Oersted, a Danish physicist, held in his hands a piece of copper wire, joined by its extremities to the two poles of a Volta pile. On his table was a magnetized needle on its pivot, and he suddenly saw (by chance you will say, but chance only favours the mind which is prepared) the needle move and take up a position quite different from the one assigned to it by terrestrial magnetism. A wire carrying an electric current deviates a magnetized needle from its position. That, gentlemen, was the birth of the modern telegraph."

You are asked to think of these quotes in a scientific context.

Create: A Reflection Post

Create an initial post reflecting on one of the two quotes above. Your reflection should be based on your knowledge of electricity and magnetism that you have gained in this module; the reflection should be scientific in nature and not purely philosophical. Your initial post should be between 150 and 200 words in length.

Explanation / Answer

i am writing on the first comment by faraday:

It is an eloquent and remarkably timeless statement. Faraday was not alone in envisioning a single theory encompassing all physical phenomena, many other scientist like Orsted who worked in the direction of unifying electricity and magnetism had the same vision for a unified physics theory but what made Faraday special is the fact that he led the charge in actually demonstrating these relations. Faraday demonstrated experimentally that magnets could induce electric currents (Faraday induction), and also compiled evidence demonstrating that the diverse sources of electricity were different manifestations of the same electrical phenomena.However in 1845 he presented a paper describing his observations that a magnetic field can indirectly influence the behavior of a light wave. This was the first definitive evidence that light and electromagnetism are related, and helped pave the way for Maxwell’s brilliant theoretical demonstration of the existence of electromagnetic waves, and their identity with light. The effect that Faraday observed is now known as Faraday rotation. Faraday’s discovery is used in several practical devices such as the optical isolator, and the Faraday rotator. From a physical point of view, Faraday’s observation was a major step in the discovery of electromagnetic waves, and remarkable for “a labourer of many years’ standing, made daily to feel my wearing out.“

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