试题与答案

如图13-7-7所示,水平虚线表示匀强电场中的两等势面,电势分别为-2 V和-3

题型:选择题

题目:

如图13-7-7所示,水平虚线表示匀强电场中的两等势面,电势分别为-2 V和-3 V,两等势面相距0.1 m,将一带电荷量为-10-6 C的点电荷从a点匀速移动到b点,ab="0.3" m,不计重力,则下列说法正确的是(   )

图13-7-7

A.所加外力大小为10-5N

B.所加外力方向竖直向上

C.所加外力的方向垂直ab斜向下方

D.外力做的功是10-6J

答案:

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