推 QQkimi:m(_ _)m 神手! 12/14 19:58
→ iyenn:只是個斷手..... 12/14 20:12
※ 引述《banqiao (小Q)》之銘言：
: 在下冊的P9-40，9-7-6
: 題目: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.
: 我要如何說明靜電場會存在PEC內部呢?
: 又和如何說明電磁波無法穿透PEC?
: 因為課本寫的看不懂所以來問一下，感謝大大們喔
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
--
為者常成.行者常至
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 123.193.214.165
※ 編輯: iyenn 來自: 123.193.214.165 (12/14 19:37)