What is the difference between Gauss's law in electrostatics and Gauss's law in magnetism?

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(N/A) Gauss's law in electrostatics states that the net electric flux through any closed surface is equal to the net charge enclosed by the surface divided by the permittivity of free space: $\oint \vec{E} \cdot d\vec{A} = \frac{q_{enclosed}}{\epsilon_0}$. This implies that electric charges exist as isolated monopoles.
Gauss's law in magnetism states that the net magnetic flux through any closed surface is always zero: $\oint \vec{B} \cdot d\vec{A} = 0$. This implies that magnetic monopoles do not exist and magnetic field lines always form continuous closed loops.

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Given below are two statements $:$ one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A) :$ Magnetic monopoles do not exist.
Reason $(R) :$ Magnetic field lines are continuous and form closed loops.
In the light of the above statements, choose the most appropriate answer from the options given below.

Assertion $(A)$: Magnetic flux is a vector quantity.
Reason $(R)$: Value of magnetic flux can be positive, negative, or zero.

The radius of a coil of $N$ turns is $R$. If the plane of the coil is placed parallel to a uniform magnetic field $B$,then the flux linked with the coil is:

Which of the following do not exist?

$A$ square of side $x \, m$ lies in the $x-y$ plane in a region where the magnetic field is given by $\vec B = B_0 (3\hat i + 4\hat j + 5\hat k ) \, T$,where $B_0$ is a constant. The magnitude of the magnetic flux passing through the square is:

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