Which of the following statements regarding magnetic lines of force is correct?

If the magnetic flux is expressed in $Weber$,then magnetic induction can be expressed in

$VS$ is the unit of which physical quantity?

$A$ long straight wire carrying a constant current $i$ is placed in the same plane as a rectangular loop of length $l$. The distance of the sides of the loop from the wire are $r_1$ and $r_2$. If the area under the curve of the magnetic field $B$ versus distance $r$ graph between $r_1$ and $r_2$ is $A$,find the magnetic flux through the loop.

Explain Gauss's law for magnetism.

Which of the following do not exist?