Question

If the electric flux leaving out the closed surface is zero, then what could be said about the surface?

Answer 1

electric flux leaving out that closed surface is zero then it is said that service is not a Gaussian surface or electric field is parallel to Gaussian surface.

Answer 2

Answer:

This leads us to the Gauss's Law, which says that the electric flux going through a closed surface, is the sum of all charges Q inside that closed surface, divided by permittivity of free space E0. If that flux is zero, that means there is no net charge inside the shape.