如图所示,平行板电容器的电容为C,带电荷量为Q,板间距离为d,今

如图所示,平行板电容器的电容为C,带电荷量为Q,板间距离为d,今在两板的中点12d处放一电荷q,则它所受电场力的大小为

A.k            B.k              C.            D.

答案

C   两板间电压U=,板间电场强度为E==,所以电荷q受到电场力为F=E·q=,选项C正确。

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