Question

Gauss law in magnetism, $\oint \overrightarrow{B}.d\overrightarrow{A}=0$, tells us

• A. that magnetic mono pole exist.
• B. that magnetic mono pole does not exist.
• C. Net magnetic flux through any closed surface is not zero.
• D. The number of magnetic field lines entering the closed surface is not equal to the number of magnetic field lines leaving the closed surface.

Answer 1

The correct option is B that magnetic mono pole does not exist.

From Gauss Law in Magnetism,

$\oint \overrightarrow{B}.d\overrightarrow{A}=0$

We can conclude that -

$\left(i\right)$ Net magnetic flux through any closed surface is always zero.

$\left(ii\right)$ The number of magnetic field lines entering the closed surface is always equal to the number of magnetic field lines leaving the closed surface.

This indicates that magnetic mono pole does not exist.

Hence, option $\left(B\right)$ is the correct answer.