Electrostatics

Consider three point charges $-2Q, Q$ and $-Q$ and three surfaces $S_1, S_2$ and $S_3$ as shown in the figure. Match the entries of List-I with that of List-II.

List-I	List-II
(a) Net flux through $S_1$	(i) $\dfrac{-2Q}{\varepsilon_0}$
(b) Net flux through $S_2$	(ii) $\dfrac{-Q}{\varepsilon_0}$
(c) Net flux through $S_3$	(iii) Zero