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31F推:推這家,有空會去吃的10/24 21:45
3F推:計時器我都把裡面接喇叭的線剪掉,因為只會用來計時而已10/10 15:56
4F推:我喜歡今天的布拉姆斯第二號^^;09/19 00:16
3F→:好的,我會寄信去,謝謝你的訊息。08/24 08:23
4F→:如果有災區要無線電,可以向NCC商借。08/25 15:26
1F推:PEC的話其內部不會有電流;一般導體在其集膚深度下有,08/17 00:25
2F→:但電流是時變的,故其內部的磁場就不會是靜磁場08/17 00:26
5F推:PEC內沒有電場及電荷,這樣會有電流嗎?08/17 01:09
1F推:第一個問題是對的,不過系統不可能一開始就存有靜磁場,08/16 21:57
2F→:所以一般在PEC裡都是電磁場為零。至於波導的內表面有08/16 21:59
3F→:表面電流,它的方向和波導傳能量的方向一樣是對的。08/16 22:01
4F→:最後靜電磁場不可能傳電磁波,因為違反能量守恆定律。08/16 22:03
3F推:3D才可以無限遠設為零,2D就不行了。你的問題是有限長,07/30 01:13
4F→:所以是3D,但是如果是無限長,那就是2D,要注意這點。07/30 01:14
4F推:我的想法是系統一直都是電中性而因為某種原因有電位差,07/25 23:02
5F→:所以使得系統在兩端有正負電荷累積,此時電荷量當然相同07/25 23:04
6F→:而不同的電位差和導致的電荷量的比值是固定的,我們就07/25 23:05
7F→:定義其為「電容」。所以從定義來看,不會有2Q和-Q的情形07/25 23:06
8F→:出現。07/25 23:06
2F推:先上網查這方面的書有那幾本被人推廌以及原因,從此下手07/23 01:32
22F推:生日快樂06/07 20:08