电流密度[Current Density] - 达人(其实～我是卧底，来自外星)

2005/05/01 | 电流密度[Current Density]
类别(Ω〖物理〗) | 评论(0) | 阅读(69) | 发表于 14:35: An electrical current flowing through a solid, and having units of charge per unit time per unit area (measured in the direction perpendicular to the flow direction). For electrons with number density flowing through a solid with velocity v, the resulting volume current J is given by
(1)

where is the charge on an electron. Experimentally, it is observed that the volume current is proportional to the applied electric field E,
(2)

where is a constant called the electrical conductivity, which is equivalent to Ohm's law.
The bound current density caused by a magnetization M is given in cgs by
(3)

where c is the speed of light and is the curl,and in MKS by
(4); 0