Question

​The magnetic induction and the intensity of magnetic field inside an iron
pole of an electromagnetic are 10 Wb m–2 and 250 Am–1 respectively.
What is the relative permeability of iron ?​(m0 = 4p × 10–7 Hm–1)

Answer 1

Dear student
$$\begin{gathered} u\sin gformula \\ {\mu }_r=\frac{B}{{\mu }_{0}H}=\frac{10}{4\pi \times {10}^{-7}\times 250}=\frac{{10}^7}{314}=0.0031\times {10}^7 \\ Regards \end{gathered}$$