Magnetic Flux - Practice Questions & MCQ

Magnetic flux-

The total number of magnetic lines of force passing normally through an area placed in a magnetic field is equal to
the magnetic flux linked with that area.

I.e for the below figure

Net magnetic flux through the surface is given by

$
\phi_B=\oint \vec{B} \cdot \overrightarrow{d A}=B A \cos \Theta
$

where
$\phi_B=$ Magnetic Flux
$B=$ Magnetic field
$\Theta=$ The angle between area vector and magnetic field vector

• Magnetic flux is a scalar quantity.
• Unit of magnetic flux -

It's S.I. unit is Weber (wb) or Tesla $\times m^2$ and its C.G.S. unit is maxwell(Mx). and $1 w b=1 \mathrm{Tm}^2$ and $1 M x=10^{-8} w b$

• The dimension of magnetic flux is $M L^2 T^{-2} A^{-1}$
• if $\theta=0$ then $\phi=B A$ and Flux will be positive.
• If $\theta=\frac{\pi}{2}$ then Flux will be zero (i.e $\phi=0$ )