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单词 Hall effect
释义 Hall effect
The production of an e.m.f. within a conductor or semiconductor through which a current is flowing when there is a strong transverse magnetic field. The potential difference develops at right angles to both the current and the field. It is caused by the deflection of charge carriers by the field and was first discovered by Edwin Hall (1855–1938). The strength of the electric field EH produced is given by the relationship
EH = RHjB
, where j is the current density, B is the magnetic flux density, and RH is a constant called the Hall coefficient . The value of RH can be shown to be 1/ne, where n is the number of charge carriers per unit volume and e is the electronic charge. The effect is used to investigate the nature of charge carriers in metals and semiconductors, in the Hall probe for the measurement of magnetic fields, and in magnetically operated switching devices. See also quantum Hall effect
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更新时间:2025/6/22 22:52:01