如图所示，一个电荷为q的点电荷位于立方体的顶点A上，则通过侧面abcd电场强度E通量等于[img=604x539]180319a740a2154.jpg[/img]
A: [img=55x25]180319a74abd2be.png[/img]
B: [img=64x25]180319a753d5cd4.png[/img]
C: [img=64x25]180319a75cf24d2.png[/img]
D: [img=64x25]180319a764c2d5b.png[/img]
A: [img=55x25]180319a74abd2be.png[/img]
B: [img=64x25]180319a753d5cd4.png[/img]
C: [img=64x25]180319a75cf24d2.png[/img]
D: [img=64x25]180319a764c2d5b.png[/img]
