Q.

The total no. of magnetic lines of force passing normal through the given area is called $\text{ "Magnetic flux" }\mathrm{\varphi }=\overrightarrow{\mathrm{B}}\cdot \overrightarrow{\mathrm{A}}=\mathrm{BAcos}\mathrm{\theta }\text{. }$
Its S.I units is weber (Wb).