試題詳解

57. What is the electric flux through a surface in between two parallel planes shown in the figure if w = 2 cm, l = 5 cm, E = 500 N/C and θ = 30°?

(A) 0.52 N⋅m² /C
(B) 0.26 N⋅m² /C
(C) 0.81 N⋅m² /C
(D) 0.43 N⋅m² /C
(E) 0.36 N⋅m² /C