Question

Identify that the net magnetic flux through a Gaussian surface (which is a closed surface) is zero.​

Answer 1

A magnetic flux, and a Gaussian surface!

Gauss's law talks about any arbitrary surface enclosing a charge and finding an electric flux, isn't it?

Think of an electric dipole, in a say, a cubical gaussian surface.

What do you think the flux may be? Zero, of course.

Net charge in the surface assumed is zero.

Now, don't get mad, I'm coming to magnetics too..

Now if I put a magnet and take out the dipole, flux, again is zero!

Reason, I was using this Dipole analogy to elaborate, that Magnets are like electric dipoles,

Moreover, Magnetic monopoles DO NOT EXIST!

You cannot isolate North pole from the South pole.

And  ya can never!