96年台联大第六题
附上网址
http://www.lib.nthu.edu.tw/library/department/ref/exam/96t/pdf/96A3A4A7.pdf
(C) 6. A charge q sits at the back corner of a cube, as shown.
The length of the edge of the cube is L and the permittivity
constant is ε. What is the flux of electric field E through
the shaded surface of the figure?
(A) 1 q (B) 1 q (C) 1 q (D) 1 q (E) 1 q