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範例:均勻電場與作功

如圖在電場強度E的均勻電場中,取基點O為圓心,取r為半徑做一圓,電場方向水平向右,直徑bdE垂直,直徑acE平行。在圓心O點固定有一電量為Q的正電荷。當把電量為-q的點電荷,放在c點恰好平衡則下列哪些是正確的? (A)E=KQ/r2(B)-q放在d點時所受合電力為2qE (C) -q放在a點時所受合電力為2qE (D)-qd點沿圓周移到b點電力所作總功為零 (E)-qd點沿圓周移到c點電力所作總功為kQ/r


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