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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2F→:不變的是真空光速08/23 20:35
6F推:1.就如wohtp大所說 2.你長直導線是指無線長嗎?那這樣不能08/15 13:43
7F→:用1/r的電位去積分 因為1/r假設無窮遠電位為0 但長直導線08/15 13:44
8F→:無窮遠電位是會爆掉的(無限大)08/15 13:44
1F推:就這種磁偶極等效的電流不會累積電荷08/12 20:04
2F→:補充一下 因為▽·J = 0就是δρ/δt=0 不會累積電荷08/12 20:07
6F推:樓上我對他問題的理解是▽ X M = J這種等效電流滿足08/12 22:01
7F→:▽·J = 0 從數學角度看當然對 但是要怎樣給個物理解釋08/12 22:01
1F推:因為另外一個dimension比波長長的多 就變幾何光學直接透07/07 22:19
2F→:過去了07/07 22:19
3F→:其實也不能說真的是幾何光學 她多少也有像球面波那樣變寬07/07 22:20
4F→:但總之在中間附近是看不太到另外一個維度的繞射07/07 22:20
3F推:I的phasor就是-j*I0阿~06/20 02:31
1F推:直覺上好像未必 折射率應該不是跟密度成正比06/14 20:49
2F噓:你的腦殘程度倒是100%傳達給我們了06/13 01:57
7F推:第二個怎麼會有感應電動勢...至少沿著他導線方向絕對沒有05/28 23:36
8F→:我是指右圖05/28 23:37
9F→:還有切割磁力線這什麼奇怪的說法?怎麼聽起來像跟國中生05/28 23:38
10F→:簡介電磁感應的講法...很籠統阿~05/28 23:38
13F推:原來是金屬盤 那確實有逕向方向的感應電動勢05/29 00:39
14F→:我其實蠻討厭這種什麼切割磁力線的說法...又籠統又無法定05/29 00:40
15F→:量討論...05/29 00:40
1F推:純粹習慣問題 E場和H場是電場和磁場強度 而D和B是電和磁05/06 03:31
2F→:通量密度 一般在電機領域的電磁學習慣用E和H 但物理領域05/06 03:32
3F→:就比較習慣使用E和B05/06 03:32
7F推:介電質超常出現的阿XDDD 我現在就一天到晚遇到介電質 反05/06 11:50
8F→:而w大說的磁性材料超少去碰05/06 11:50
4F推:真空也可以傳遞 所以不需要介質 這也是為啥以前有人去想05/04 14:59
5F→:有乙太這種玩意兒 但是後來被證明沒有05/04 14:59