問題詳情
如右圖所示，質量均為 m 的兩個帶電小球 A 和 B 放置在光滑的絕緣水平面上，彼此相距為 L，A 球帶電+Q，B 球帶電-Q，若用一水平拉力拉動其中一個球，且要使另一個球與前面的球始終保 L 的間距運動，則拉力 F 的大小為__________。
參考答案
答案：D
難度：適中0.690122
統計：A(71),B(105),C(53),D(510),E(0) #
個人：尚未作答書單：租賃專有名詞解釋
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