問題詳情
21.如圖所示，光滑絕緣的水平面上固定著 A、B、C 三個帶電小球，它們的質量為 ，間距均為 m r （r 遠大於小球的直徑），A、B 帶正電，電量均為 ，現對 C 施一垂直於 A、B 連線的水平力 ，同時釋放三個小球，欲使三個小球在運動過程中保持間距q Fr 不變：
(A)C 球帶正電
(B)C 球帶負電
(C)C 球帶電量2q
(D) C 球帶電量q
(E)
。 
(A)C 球帶正電
(B)C 球帶負電
(C)C 球帶電量2q
(D) C 球帶電量q
(E)
。
參考答案
答案：B,C,E
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)
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