电流环[Current Ring] - 达人(其实～我是卧底，来自外星)

2005/05/01 | 电流环[Current Ring]
类别(Ω〖物理〗) | 评论(0) | 阅读(43) | 发表于 14:45: Let a ring of radius a carry a current I, and set up cylindrical coordinates . Let be the angle between the z axis and the observer.
On-axis, in cgs
(1)

where c is the speed of light, so

(2)

In MKS,
(3)

where is the permeability of free space, so

(4)

Off-axis in MKS, the magnetic vector potential is

(5)

where
(6)

and K(k) and E(k) are complete elliptic integrals of the first and second kind with modulus k.; 0