Question

Point charges 30 C, –20 C and 10 C are located at (–1, 0, 2), (0, 0, 0) and (1, 5, –1) respectively. The total electric flux leaving cube of side 6 m centered at the origin is

(A) -20/ɛ₀

(B) 10/ɛ₀

(C) 20/ɛ₀

(D) 20/ɛ₀

Answer 1

Correct option (B) 10/ɛ₀  

Explanation:

Use Gauss’ law. The contribution to flux is only due to charges located at (−1,0,2) and (0,0,0) since they are inside the cube.