[電磁] 台大轉 類似題

看板TransPhys作者 (割掉Q)時間15年前 (2009/04/11 22:20), 編輯推噓5(5推 0噓 11→)
留言16則, 6人參與, 最新討論串1/1
[台大轉] A slab of copper thickness b is placed into a parallel plate capacitors as shown in figure below; it is exactly halfway between the plates. (a)What is the capacitance after the slab is introduced? (b)If a charge Q is maintained on the plates, find the ratio of the stored energy before to that after the slab in inserted. (c)What is the force on the slab due to the plates? ↙ ______________________ w ╱ plate ╱ ____ ╱ ╱￣￣￣￣￣￣↗∕| ↗ ╱←__ L _ → ╱ copper w ∕ | ↑ | ￣￣╱￣￣￣∕￣￣￣￣ ↙ _∕ ∕ a | ╱ |￣￣￣￣￣￣￣￣￣￣￣￣ |b∕ | ╱← x →| _ |∕ ↓ | ╱ ￣￣￣￣￣╱￣￣￣￣￣￣￣ ￣￣￣￣￣￣￣￣￣￣￣￣ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 58.115.138.169 ※ 編輯: Qmmm 來自: 58.115.137.72 (04/12 14:19)
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04/13 02:14, , 1F
台大真是 = =這給大二的學生還不見得會寫吧
04/13 02:14, 1F
推
04/13 13:18, , 2F
我補習班講義上有這題耶~"~
04/13 13:18, 2F
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04/13 14:06, , 3F
剛找一下 老吳講義也有@@
04/13 14:06, 3F
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04/13 22:36, , 4F
to 1F (a)、(b)其實還好 (c)就真的比較難
04/13 22:36, 4F
推
04/14 14:03, , 5F
不好意思看錯題了，光看圖還以為是cheng後面的習題XD
04/14 14:03, 5F
推
04/15 01:34, , 6F
(c) F=-▽V 原文書有哦(⊙o⊙)
04/15 01:34, 6F
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04/15 01:39, , 7F
F=-▽V @@? 請問V是指?
04/15 01:39, 7F
推
04/15 01:55, , 8F
打錯，是U 位能
04/15 01:55, 8F
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04/15 11:32, , 9F
XD 3q
04/15 11:32, 9F
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04/15 15:19, , 10F
忽然想到一個問題，向量微積分大一會教嗎，不好意思
04/15 15:19, 10F
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04/15 15:19, , 11F
離大一年代太久遠了~"~
04/15 15:19, 11F
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04/15 15:20, , 12F
像grad divergence crul之類的
04/15 15:20, 12F
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04/15 16:45, , 13F
梯度至少在教多變數時會教,EX方向導數.算子的內外積
04/15 16:45, 13F
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04/15 16:46, , 14F
可能要看科系,商管的可能比較不會教
04/15 16:46, 14F
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04/15 19:43, , 15F
現在小大一真辛苦，印象中我到修電磁才開始學
04/15 19:43, 15F
推
04/18 01:08, , 16F
這題不是基本題嗎?
04/18 01:08, 16F
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