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範例:多質點電荷之電位(能)與力學能守恆[88高聯]

右圖所示,在xy平面上分置六個+Q點電荷形成一邊長為a的正六邊形,其中點為O,則: (1)沿Z軸方向,P點,其電場為何? (2)P點置一質量m,電量 –q的質點,自P點沿Z軸射至無限遠處,所須之最小初速度為何?[88高聯]


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