The unit of magnetic flux is

The dimensional formula of magnetic flux is:

The dimensions of magnetic flux are

When the surface of a sheet is parallel to the magnetic field,what is the magnetic flux linked with it?

$A$ uniform magnetic field of strength $B=2 \text{ mT}$ exists vertically downwards. These magnetic field lines pass through a closed surface as shown in the figure. The closed surface consists of a hemisphere $S_1$,a right circular cone $S_2$,and a circular surface $S_3$. The magnetic flux through $S_1$ and $S_2$ are respectively:

Which of the following conclusions can be drawn from the result $\oint \vec{B} \cdot d\vec{A} = 0$?