An iron rod of susceptibility $599$ is subjected to a magnetising field of $1200 \, A m^{-1}$. The permeability of the material of the rod is $(\mu_{0} = 4 \pi \times 10^{-7} \, T m A^{-1})$.
- A$2.4 \pi \times 10^{-7} \, T m A^{-1}$
- B$2.4 \pi \times 10^{-4} \, T m A^{-1}$
- C$8.0 \times 10^{-5} \, T m A^{-1}$
- D$2.4 \pi \times 10^{-5} \, T m A^{-1}$
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