If ∮E.ds=0 over a surface, then :

(i) the electric field inside the surface and on it is zero

(ii) the electric field inside the surface is necessarily uniform

(iii) the number of flux lines entering the surface must be equal to the number of flux lines leaving it

(iv) all charges must necessarily be outside the surface.

Only (iii) is correct

$\text{Flux is zero means charge inside the closed surface is zero}$

$\text{The number of flux lines entering the surface must be equal to the number of flux lines leaving it}$