Q.

Five charges +q, +5q, −2q, +3q and −4q are situated as shown in the figure. The electric flux due to this configuration through the surface S is        [2024]

1 5qε0   
2 4qε0  
3 3qε0  
4 qε0  

Ans.

(2)

As per Gauss' theorem,

ϕ=qinε0=q+(-2q)+5qε0=4qε0