如图所示,平行板电容器与恒定电源相连,负极板接地,在两板间

 如图所示,平行板电容器与恒定电源相连,负极板接地,在两板间有一负电荷(电荷量很少且不变)固定在P点,以U表示电容两极板间的电压,E表示两极板间的场强,Ep表示负电荷在P点的电势能,若保持负极板不动,而将正极板向上移至某位置,则

A.E变小,Ep变大       B.E变大,Ep变大

C.E变小,Ep变小       D.E变大,Ep变小

 

答案

 A

 

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