作者iyenn (晓风)
看板Grad-ProbAsk
标题Re: [理工] [电磁] 第十版的几题问题想问一下
时间Mon Dec 14 19:27:52 2009
※ 引述《banqiao (小Q)》之铭言:
: 在下册的P9-40,9-7-6
: 题目:1.Can a static magnetic field exist in the interior of a
: perfect conductor?Explain.
: 2.Can a time varying magnetic field exist in the interior
: of a perfect conductor?Explain.
: 我要如何说明静电场会存在PEC内部呢?
: 又和如何说明电磁波无法穿透PEC?
: 因为课本写的看不懂所以来问一下,感谢大大们喔
1.
from Maxwell eq
@B
▽‧E= - ---
@t
conductor s.t. Ein=0
@B
hence ---- =0 =>B independent of time
@t
2. for plane wave ,E depend on time .
Perfect Conductor s.t. δ->0
hence Ein=O
H depend on E s.t. H=0
--
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