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2005/04/06 | 点电荷[Point Charge]
类别(Ω〖物理〗)
|
评论
(0)
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阅读(43)
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发表于 15:02
A point charge is a hypothetical
charge
located at a single point in space. While an
electron
can for many purposes be considered a point charge, its size can be characterized by length scale known as the
electron radius
.
In
cgs
, the
magnetic field
at a point
r
of a slowly moving charge
q
at position
is given by
(1)
where
v
is the charge's velocity and
c
is the
speed of light
, and in
MKS
,
(2)
The magnetic and electric fields of a moving charge are related in
cgs
by
(3)
and in
MKS
by
(4)
For relativistic speeds, from the
Liénard-Wiechert potentials
, it follows that
(5)
(6)
where
is
relativistic beta
and
a
is the acceleration.
0
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