問題詳情
一質量為m帶電量為＋q的質點，自一邊長皆為L的正方形容器之頂端中央靜止釋放，容器中通有向右的水平電場，若質點恰可從底端邊緣小孔逸出，如圖3所示，試求質點自靜止釋放到逸出之過程共獲得的衝量大小___________（以m、L、g 表示）
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