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範例:均勻電場與動力學

真空匣內有一對平行金屬板帶等量異性電荷而相距d，兩板間之均勻電場強度為E。有質量為m，荷電量為–e之電子自靜止離開負板抵達正板，假定不考慮重力作用(A)加速度為eE/m。(B)抵達正板瞬間速率為(2eEd/m)1/2(C)需時2dm/eE (D)電子在飛越期間所受衝量大小為(2meEd)1/2(E)動能eEd。


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Posted in 電場與電力線.

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By admin – 2010 年 03 月 04 日

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