题目内容

一空气平行板电容器，充电后把电源断开,这时电容器中储存的能量为W0，然后在两板间充满相对电容率为er的各向同性均匀电介质，则该电容器中储存的能量W为

A. W = erW0 ;
B. W = W0/er ;
C. W = (1+er)W0 ;
D. W = W0.

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