Magnetic flux passing through a surface is given as
\(\phi=B A\)
where, \(A=\) area and \(B=\) magnetic induction.
\(\therefore \quad B=\frac{\phi}{A} \mathrm{~Wb} / \mathrm{m}^2\)
\(\therefore\) Unit of magnetic induction \(B\) is \(\mathrm{Wbm}^{-2}\).