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ch17 p.64 170413 右圖
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電學
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郭俊偉
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Jun 1, 2013, 4:36:03 AM
6/1/13
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球面電位V均相等,若要求整個球的電位能如何算?
註:前面(p.58開始)只有提到不連續的電荷分布求"電位能"
討論區板主
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Jun 3, 2013, 11:07:43 AM
6/3/13
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您好:
這個問題必須要用積分解決
並且,從電容的角度去處理會比較快
請先了解一下什麼是電容,建議您先看一下170501及170502
您會發現您的問題就是17502的第三題
再來您可能想問為何
U = (1/2) C V
^2
這裡就要用到積分了
可以參考這裡的推導:
http://163.13.111.54/general_physics/week-06_day-3__capacitors_resistors_n_circuits.html
很巧妙的推導出電容器的電位能公式,您可以注意一下,這公式適用於各種形狀的電容
郭俊偉於 2013年6月1日星期六UTC+8下午4時36分03秒寫道:
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