Figure shows four charges `q_1,q_2,q_3,and q_4` fixed is space. Then the total flux of the electric field through a closed surface S, due to all the charges, is

Options

A. not equal to the total flux through S due to `q_3 and q_4`
B. equal to the total flux through S due to `q_3 and q_4`
C. zero if `q_1 + q_2 = q_3 +q_4`
D. twice the total flux through S due to `q_3 and q_4 if q_1+q_2 = q_3+q_4`.

Answer

B

Explanation

b. Net flux is due to charges inside S only.