作者查詢 / profyang
作者 profyang 在 PTT [ Physics ] 看板的留言(推文), 共1072則
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9F推:痾...要看吧~反正你x都大於0 改寫成exp(-x)/(1-exp(-x))03/29 00:13
10F→:不就收斂?再利用均勻收斂就可以把積分與無窮級數順序對調03/29 00:14
25F推:也不能這樣說 收斂性還是重要的 就算以實用角度去看 畢竟03/31 21:51
26F→:許多級數你實際要去算然是從數值上去求 此時不收斂的話..03/31 21:52
4F推:原PO講的基本上沒錯啊 作用力等於反作用力 在靜電磁學都03/28 14:55
5F→:還是正確的03/28 14:55
8F推:電磁學中動量守恆還是成立的 而既然是靜電磁學的話可忽略03/29 02:42
9F→:電磁波本身動量 所以作用力仍等於反作用力03/29 02:42
7F推:因為他強 用這三個當基本定律可以推一堆東西出來03/16 22:11
1F推:就dc吧03/16 08:28
2F推:....不然你以為會是多少XDD 事實上 它的輻射電場正比於03/13 01:48
3F→:他本身的加速度 其他不是正比於加速度的在遠場可忽略03/13 01:48
2F推:....不然你以為會是多少XDD 事實上 它的輻射電場正比於03/13 01:48
3F→:他本身的加速度 其他不是正比於加速度的在遠場可忽略03/13 01:48
1F推:夠吧 告訴你緯度就知道他轉動週期(一天幾小時?) 知道週期03/10 22:37
2F→:又知道半徑當然就有相對地心的速率 然後利用向心加速03/10 22:37
3F→:有點打錯 是告訴你緯度才能知道相對地心速率03/10 22:38
1F推:我前面那篇的意思就是內部空間沒有電荷的話 所有導體中的01/29 17:28
2F→:電荷都會跑到外表面 如果內部空間有的話 就導體內外表面01/29 17:28
3F→:都會有電荷 所以你那個內部長針的那個它內表面還是沒有01/29 17:29
4F→:電荷 因為它內部空間沒有電荷01/29 17:29
5F→:帶刺球殼也還是空心的 只是他長得比較奇怪01/29 17:30
6F推:喔不好意思沒看清楚 所以你這篇第二個問題是指帶刺球殼01/29 17:33
7F→:而且內部空間也有電荷?那這樣導體內表面當然也會有電荷01/29 17:33
8F→:我不是很確定你那邊寫的q是只在導體上還是有在內部空間01/29 17:35
9F→:另外 你本來的理解的確不對 跟面積大小無關01/29 17:36
1F推:電荷只會分布在球體之外表面 所以內部怎樣沒差01/29 13:19
1F推:第一題要用lagendre polynomial展開耶~很複雜喔~01/27 09:48
2F→:第二題應該也是一樣 詳情參見Jackson01/27 09:48