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ch17 p52 DVD170355
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電學
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郭俊偉
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May 11, 2013, 2:27:36 PM
5/11/13
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to feynm...@googlegroups.com
1.關於電通量的定義在附檔的圖中並不符合耶(因為跟角度無關)!?
電通量.JPG
討論區板主
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May 16, 2013, 9:01:28 AM
5/16/13
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您好:
因為您畫的電力線太少(如下圖一),如果是圖二。就可以看出差異
以數學式來推導
就是圖一中的電場太小(或是截面積太小),趨近於零
推導如下
Φ1=EAcosθ1
Φ2=EAcosθ2
如果電通量Φ1=Φ2
則EA(cosθ1-cosθ2)=0
有三個解E=0,A=0,cosθ1=cosθ2
圖一屬於E或A其中之一趨近於零的狀態
郭俊偉於 2013年5月12日星期日UTC+8上午2時27分36秒寫道:
1.關於電通量的定義在附檔的圖中並不符合耶(因為跟角度無關)!?
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