試題詳解

13. The flux of the electric fieldN/C through a 2 m² portion of the xz plane is ______.
(A) 16 N●m² /C
(B) −48 N●m² /C
(C) 48 N●m² /C
(D) −60 N●m² /C
(E) 60 N●m² /C