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ek qv 在 [問題] 物理問題- 看板SENIORHIGH - 批踢踢實業坊 的必吃


作者Sporting (曼德拉)
看板SENIORHIGH
標題[問題] 物理問題
時間Tue Mar 26 18:25:06 2019

打擾各位一階放榜了...
1.


我用其他方式算的出來但若用這個方法不知道錯在哪？
總電阻=12+2+1=15
電壓=12-4=8（電池反接）—感覺是這步算錯
總電流=8/15
但總電流是0.5A


2.


洛仁茲力圓周運動推導中為什麼「動能=qv」，不是「電位能=qv」嗎？是因為只有一個電荷在運動嗎？

那多質點運動是不是就不適用這個公式呢？

謝謝回答！
謝謝回答！
謝謝回答！

--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 42.72.5.129
※ 文章網址: https://www.ptt.cc/bbs/SENIORHIGH/M.1553595909.A.2EC.html
推 Kershaw0817: 邱博文03/26 18:31
推 j0958322080: #1OkDBzO503/26 19:08
→ j0958322080: 第二題不知道你想問什麼03/26 19:08
第一題懂了，謝謝
推 NTUfin: 電壓算錯了 蓄電池是3V 然後電動機也有1.5v 第二題是當初03/26 19:37
→ NTUfin: 初速是來自加速電壓加速03/26 19:37
我的問題應該是P=根號2mEk 但是推導中下一行變成2m(qv)
但是靜電那章有U(電位能）=qv的公式
那為什麼現在*動能可以用電位能公式*代進去
（希望看得到
推 chun10396974: 第一題除了燈泡以外的兩個元件你根本不知道總電阻是03/27 01:15
→ chun10396974: 多少，你只知道經過那兩個元件後電位下降6伏特，電03/27 01:15
→ chun10396974: 源供給12伏特，which implies that燈泡跨壓是6伏特03/27 01:15
→ chun10396974: ，對燈泡apply R=V/I，所以總電流=0.5A03/27 01:15
我忘了考慮”電池不符合r=v/i了，謝謝
※ 編輯: Sporting (42.72.35.34), 03/27/2019 12:58:28
推 chun10396974: 電荷因不具有位能，因此其動能完全來自於電位能的轉03/28 02:15
推 chun10396974: 電荷因不具有位能，因此其動能完全來自於電位能的轉03/28 02:15
→ chun10396974: 換因此U=qV=Ek03/28 02:15
→ chun10396974: 換因此U=qV=Ek03/28 02:15
請問一下所以這種情況是”一個”電荷在移動時才有這種轉換，那”多個”電荷在移動時因為彼此間有電位能，所以不能這樣轉換，這樣對嗎？
※ 編輯: Sporting (114.137.241.249), 03/28/2019 09:44:18
推 chun10396974: 可以這樣理解沒錯，但是只要間距沒變電位能就沒變，03/28 13:53
→ chun10396974: 等號也就還是成立03/28 13:53
謝囉，回答得超詳細^ ^
※ 編輯: Sporting (59.102.235.225), 03/29/2019 07:07:29






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洛仁茲力圓周運動推導中為什麼「動能=qv」，不是「電位能=qv」嗎？是因為只有一個電荷在運動嗎？ 那多質點運動是不是就不適用這個公式呢？ 謝謝回答！

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