一个空气平行板电容器, 充电后把电源断开 ,这时电容器中储存的能量为W 0 ,然后在两极板间充满相对介电常数为ε r 的各向同性均匀电介质,则该电容器中储存的能量为
A.
e r W 0
B.
W 0 / e r
C.
(1+ e r )W 0
D.
W 0
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