[題目] 靜電力
[領域] 物理 靜電力
[來源] 考卷
[題目] 有一個點電荷q與一無限大金屬平行板的垂直距離為d,
請問電荷與金屬板的作用力為多少?
+代表排斥力
-代表吸引力
[瓶頸] 題目沒有給金屬板的厚度,求的出來?
答:-kq^2/4d^2
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