如图所示,电容器电容为C,两板间电势差为U,场强为E(E是左右两板

如图所示,电容器电容为C,两板间电势差为U,场强为E(E是左右两板场强的矢量叠加),现将右极板缓慢向右平移距离d,移动过程中电容器电势能增加量为:(    

ACU2   BCU2   CCUEd   DCUEd

答案

C

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