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Hall effect

The Hall effect is the generation of an electromotive force, or a potential difference, across a conductor or semiconductor when it is carrying a current perpendicular to a magnetic field around it. The voltage is at right-angles (90°) to both the direction of the current and the direction of the magnetic field, and arises from the deflection of moving charge carriers – electrons or holes – by the magnetic field. The effect was discovered in 1879 by the American physicist Edwin H. Hall (1855–1938). (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/H/Hall_effect.html)

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