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【单选题】
一个平行板电容器,充电后断开电源,使电容器两极板间距离变小,则两极板间的电势差 U 12 ,电场强度的大小 E ,电场能量 W 将发生如下变化A.
U 12 减小， E 减小， W 减小
B.
U 12 增大， E 增大， W 增大
C.
U 12 增大， E 不变， W 增大
D.
U 12 减小， E 不变， W 减小
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