A magnetizing field of $5000 \mathrm{~A} / \mathrm{m}$ produces a magnetic flux of $4 \times 10^{-5} \mathrm{~Wb}$ in an iron rod of cross-sectional area $0.4 \mathrm{~cm}^2$. The permeabilit of the rod in Wb/A-m, is
- A$4 \times 10^{-6}$
- B$1 \times 10^{-3}$
- C$2 \times 10^{-4}$
- D$3 \times 10^{-5}$
✓ Correct answer: C
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