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範例:靜電力與靜力平衡[83日大]

如右圖所示,兩個一樣大小,相同質量的小球,甲球帶正電荷+Q,乙球帶負電荷-Q,兩球以一均勻絕緣細桿相連接,桿與兩球總重量為mg,乙球又以一絕緣細線懸掛,整個系統在一方向朝上之均勻電場E中成靜力平衡。下列敘述何者正確?(A)不論電場量值E為何,細線與鉛直線之夾角θ為零 (B)細線之張力的量值恆為mg (C)mg=2QE時,細桿與水平線之夾角α任意值 (D)2QE不得大於mg,否則系統不可能平衡 (E)QE不得小於mg,否則系統不可能平衡。83日大】【84中一中】


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Posted in 歷屆物理考題, 電場與電力線.

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