The magnetic induction and the intensity of the magnetic field inside an iron core of an electromagnet are $1 \ Wb \ m^{-2}$ and $150 \ A \ m^{-1}$, respectively. The relative permeability of iron is $(\mu_0 = 4 \pi \times 10^{-7} \ H \ m^{-1})$.
- A$\frac{10^6}{4 \pi}$
- B$\frac{10^6}{6 \pi}$
- C$\frac{10^5}{4 \pi}$
- D$\frac{10^5}{6 \pi}$
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