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磁通量[Magnetic Flux] [2005-10-1]
iamet 发表在 Ω〖物理〗
| Measuring the magnetic field passing through a cross sectional area S gives the magnetic flux  , where
B is the magnetic field vector, and  is a differential unit of area pointing perpendicular to the surface S.Knowing allows the electromotive force  produced in a current ring with S as its boundary to be computed using Faraday's law as
Therefore, an electromotive force is created only when the flux changes with time, which means only when B or change with time. |
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