$A$ magnetic intensity of $500 \,A/m$ produces a magnetic flux of $2.4 \times 10^{-5} \,Wb$ in an iron bar of cross-sectional area $0.4 \,cm^2$. The magnetic permeability of the iron bar is
- A$2.4 \times 10^{-3} \,T \cdot m/A$
- B$1.2 \times 10^{-3} \,T \cdot m/A$
- C$2.4 \times 10^{-4} \,T \cdot m/A$
- D$1.2 \times 10^{-4} \,T \cdot m/A$
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