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【单选题】
在电场强度为E的电场中,有一如图2所示的三棱柱,取表面的法线向外,设过面AA¢CO,面B¢BOC,面ABB¢A¢的电通量为F 1 ,F 2 ,F 3 ,则( )A.
F 1 =0, F 2 =Ebc, F 3 =-Ebc.
B.
F 1 =-Eac, F 2 =0, F 3 =Eac.
C.
F 1 =-Eac, F 2 =-Ec , F 3 =-Ebc.
D.
F 1 =Eac, F 2 =Ec , F 3 =Ebc.
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A.
不填；a
B.
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C.
the；不填
D.
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