等量异种点电荷的连线和其中垂线如图所示,现将一个带负电的检验

等量异种点电荷的连线和其中垂线如图所示,现将一个带负电的检验电荷先从图中a点沿直线到b点,再从b点沿直线移到c点,则检验电荷在此全过程中

A.所受电场力的方向不变

B.所受电场力的大小恒定

C.电势能一直减小

D.电势能先不变后减小

答案

AD

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