試題詳解

45. Two charges of 15 pC and −40 pC are inside a cube with sides that are of 0.40 m length. Determine the net electric flux through the surface of the cube. (εo= 8.85 x 10^-12 C² / N•m² )
(A) 2.8 N•m² /C
(B) −2.8 N•m² /C
(C) 1.1 N•m² /C
(D) −1.1 N•m² /C
(E) −0.47 N•m² /C