The Application Of Magnetic Forces: The Hall Effect
The hall effect was discovered by Edwin hall in 1879. He observed that when the semi conductor is placed in a magnetic field acting in the direction perpendicular to the current flowing in it then an electric fields is generated which is mutually perpendicular to current and magnetic field. The potential difference which is observed across the surface of the semi-conductor is known as hall voltage.
The whole story behind the hall effect is the application of magnetic force known as Lorentz force on the moving charge carrier that is electon, which deviate the electons from its straight line motion and get deposited on one of the surface of the semi-conductor sample.
In sample of semi conductors when potential across it is applied the current in it stars flowing due to the movement of electrns. When this whole sample is placed in magnetic field which is perpendicular to the current flowing in it. As we know that moving electon constitute the current, those smallest unit of current experiences a force according to Fleming’s left hand rule which states that when the electon is moving perpendicular to the magnetic field a magnetic force is generatd which acts in the mutually perpendicular direction to current and magnetic field.
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The Hall_Effect is the production of a voltage difference(Hall voltage) across an electrical carrier, transverse to an electric current in carrier and a magnetic field perpendicular to the current. The forces acting on the moving charges in a carrier in a magnetic field is strikingly demonstrated by the Hall_Effect, an effect analogous to the transverse deflection of an electon beam in a magnetic field in vacuum. The effect was discovered by the American physicist Edwin Hall in 1879 while he was still working on his doctoral degree at Johns Hopkins University in Baltimore,
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