On This Day - Sep 13 - English chemist Michael Faraday discovers the 'Faraday effect', the influence of a magnetic field on polarized light

12-09-2023

(Wcsa.world) Michael Faraday is often called the father of electrical engineering. His most famous achievement was the discovery of electromagnetic induction in 1831, creating an electrical current from a charging magnetic field.

He went on to invent the first electric motor, the first electrical transformer, the first electric generator and the first dynamo, paving the way for the use of electricity on a large scale.

Faraday rose from humble origins and got his big break when he convinced the eminent chemist Humphry Davy to hire him as an assistant at the Royal Institution. Faraday's other achievements include the discovery of Benzene and the influence of light on a magnetic field 'the Faraday effect'.

In 1845, Faraday discovered that many materials exhibit a weak repulsion from a magnetic field: a phenomenon he termed diamagnetism.

Faraday also discovered that the plane of polarization of linearly polarized light can be rotated by the application of an external magnetic field aligned with the direction in which the light is moving. This is now termed the Faraday effect. In Sept 1845 he wrote in his notebook, "I have at last succeeded in illuminating a magnetic curve or line of force and in magnetising a ray of light".

Later on in his life, in 1862, Faraday used a spectroscope to search for a different alteration of light, the change of spectral lines by an applied magnetic field. The equipment available to him was, however, insufficient for a definite determination of spectral change. Pieter Zeeman later used an improved apparatus to study the same phenomenon, publishing his results in 1897 and receiving the 1902 Nobel Prize in Physics for his success. In both his 1897 paper and his Nobel acceptance speech, Zeeman made reference to Faraday's work.

According to Wikipedia


Yun Ruan (Editor) - World Creativity Science Academy - WCSA