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作者 profyang 在 PTT [ Physics ] 看板的留言(推文), 共1072則
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32F→:幹 有事嗎?不要扯到姓楊的身上來!11/08 01:19
2F推:座標改一下 球座標的z軸轉個方向 也就是讓你的γ變成積分11/06 01:30
3F→:θ'11/06 01:30
4F→:上面2F打錯 就積分變數變成γ而不是θ'11/06 01:31
5F→:ψ'也要改 但反正就是z軸轉一下就對了11/06 01:32
6F→:dΩ=sinγdγdψ'' 這樣就好了 積分範圍一樣 這樣一樣是11/06 01:33
7F→:整個球面11/06 01:33
1F推:積分裡面的東西正比於R^-3 但是球面積是R^2 所以趨近011/02 18:04
4F推:若電荷分布是局部的 你可以從很遠的地方包住電荷用高斯11/02 20:30
5F→:這樣就可以證明電場是O(1/R^2)11/02 20:31
6F推:因為從很遠的地方看的話 該電荷分布一階近似就是集中一點11/02 20:33
7F推:我記得這green' theorem積分時不是有個delta function11/02 21:20
8F→:你這是化簡過的 一開始有個電荷密度的laplacian11/02 21:21
9F推:打到一半忘了打 那個delta function在範圍外積分就變0了11/02 21:29
6F推:beta射線也算輻射 所以輻射不一定是電磁波 而弱弱的紅外10/30 18:23
7F→:線你應該也不會把他叫做輻射 簡單來說能量強的電磁波會10/30 18:24
8F→:把他叫輻射 但不是所有輻射都是電磁波10/30 18:24
10F→:對耶 我錯了 這樣電磁波是輻射的一種10/30 18:43
1F推:r>R之後就只有I 沒有(πr^2 / πR^2)I10/29 15:16
2F→:而且你這個R應該是導線的半徑而不是plate的半徑10/29 15:17
5F推:1基本上沒錯 2有點怪怪的 重點是時變電場產生的磁場10/29 18:40
6F→:你講+Q-Q"停留"在兩板讓我覺得你好像沒抓到安培-馬克斯威10/29 18:42
7F→:方程的精隨10/29 18:42
8F→:事實上他電荷和I都是時變的 電場也是時變的 磁場也是10/29 18:42
7F推:決定顏色的是頻率而非波長10/11 22:57
2F推:伏特計不是導線 他有種量完110V後直接用手觸摸兩端...10/07 01:47
3F→:不過印象中110V好像也不致死 會蠻痛的就是了 除非電太久10/07 01:48
12F推:或者他電表兩端插火線水線然後手還敢去摸電表兩端...10/07 07:20
15F推:結果怎樣?(超配合XD)10/07 13:31
1F推:V(group)*V(phase)=c^2 這好像是用相對論推的08/29 21:45
2F推:第二個好像是根據薛丁格 沒有考慮相對論效應08/29 21:51
10F推:誠如二樓所說08/29 07:02
25F推:.......請先看懂傳輸線是怎麼回事08/24 21:57