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作者 profyang 在 PTT [ Physics ] 看板的留言(推文), 共1072則
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1F推: http://goo.gl/wWSwFW 第一行左邊數來第三個06/20 11:05
3F推: google 'transmission line impedance formula' 第三個06/21 15:27
3F推: 當然要定義清楚加電壓的位置阿 你就想一個人從頭到腳的06/15 01:43
4F→: 阻值有可能跟從頭到手的阻值一樣嗎?06/15 01:43
11F推: 這篇是對的 應該會有後面時變電場那項04/30 19:02
3F→: E是時變電場E0*exp(jωt)這樣的形式 所以才會有ω跑出來04/10 18:34
4F→: 阿sorry會錯你的意 E只要在受力的電子那附近是均勻就好04/10 18:34
5F→: 對整個空間不用是均勻的04/10 18:35
6F→: 電子那麼小 通常都假設在他那附近電場是均勻的04/10 18:36
13F→: 可是把它們丟掉是錯的嗎? 至少以數量級而言可以忽略吧04/10 19:59
23F→: 以上是參照Feynman Lecture Vol 2, Ch3204/10 20:17
24F→: 另外 可見光波段應該有到10^14~10^15 所以可見光波段時04/10 20:31
25F→: 金屬介電係數就可能是負的實數了04/10 20:31
28F→: 不會那麼小吧= =" 這樣感覺電阻好大04/10 21:02
3F推: C1和C2是complex conjugate就好了啊04/07 15:41
10F推: 不接地不是-Q吧...要看你原先金屬上的電荷04/04 00:30
2F推: 邊界質問題就是偏微分方程他給你邊界條件求解阿04/03 08:54
3F→: 然後電磁學又不是只有靜電學 不一定是laplace04/03 08:55
4F推: 不一定要有界線 廣義來講無窮遠也算一個邊界 除了laplac04/03 10:23
5F→: 還有wave eq阿~然後頻域的helmholtz eq也是04/03 10:24
6F→: 然後雖然電磁學應該不見得會出現 一般還有個diffusion04/03 10:25
14F推: 你現在看到的星星都是歷史阿...03/27 03:34
3F推: 之前不是有youtube兩個手機還四個手機一起被撥打 爆米花03/23 11:48
4F→: 在中間就被爆開了?顆顆 好吧這個好像更瞎...03/23 11:49
26F推: 認真回你 你講的話沒有辦法證明 你說可能有個更簡單的理03/22 19:49
27F→: 論可以解釋電磁 重力現象 你有辦法證明嗎? 何況在這之前03/22 19:50
28F→: 你還要先定義何謂簡單 是你看得懂叫做簡單呢?還是我看得03/22 19:50
29F→: 懂叫做簡單?還是愛因斯坦看得懂叫做簡單?03/22 19:51
30F→: 你問的這些根本不算物理問題 我覺得比較像哲學問題= =03/22 19:51
31F→: 不過應該勉強算科學哲學的問題吧03/22 19:52