 |
| 我的日历 |
| |
|
| 分类日志 |
| |
|
| 友情链接 |
|
|
| 最新评论 |
|
|
| 搜索日志 |
|
|
| 访问计数 |
|
|
| 获取 RSS |
| |
 | |
| |
磁标势[Magnetic Scalar Potential] [2005-10-5]
iamet 发表在 Ω〖物理〗
| In MKS, magnetic field must satisfy the Maxwell equation
 (1)
where  is the permittivity of free space. If electric fields are not present or are slowly varying, displacement current can be ignored, then
 (2)
If additionally there is almost no external current, then
 (3)
So, to a good approximation,
 (4)
Therefore, in this approximation, B can be represented as the gradient of a scalar function
 (5)
Because there are no magnetic monopoles, another of the Maxwell equations gives
 (6)
everywhere, so  satisfies Laplace's equation
 (7)
and can be written as a Laplace series
  (8)
where  is a generalized Legendre polynomial. |
学好数理化，走遍天下都不怕！ | |
|
|
