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毕奥-萨伐尔定律[Biot-Savart Law] [2005-8-31]
iamet 发表在 Ω〖物理〗
| The Biot-Savart law, also known as Ampère's law or Laplace's law is equivalent to the steady state Maxwell equation in free space, and relates the a spatially varying magnetic field to the current density. In cgs, it is given by
 (1)
where  denotes the curl,B is the magnetic field, c is the speed of light, J is the current density. In MKS,
 (2)
where  is the permeability of free space.
For a continuous distribution in cgs
 (3)
and in MKS
 (4)
For a wire carrying current I in cgs
 (5)
where  is a differential length element of wire, and in MKS
 (6)
where
For a point charge q moving with velocity v in cgs
 (7)
and in MKS
 (8) |
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