电偶极子力矩[Electric Dipole Moment] - 达人(其实～我是卧底，来自外星)

2005/01/07 | 电偶极子力矩[Electric Dipole Moment]
类别(Ω〖物理〗) | 评论(0) | 阅读(64) | 发表于 13:41: For a continuous charge distribution, the electric dipole moment is given by
(1)

where r points from positive to negative. For a discrete charge distribution
(2)

where r points from positive to negative.

As can be seen from the definition, the vector dipole moment can be dependent on the origin. To see when this is the case, define an arbitrary new origin offset from the original one by the vector and find when the two dipole moments are equal,
(3)

which will be true when
(4)

since is a constant. Therefore, p is independent of origin iff
The dipole field induced by an electric field E is
(5)

where is the atomic polarizibility tensor and
(6); 0