$A$ solenoid of $500$ turns $/ m$ is carrying a current of $3 \ A$. Its core is made of iron which has a relative permeability of $5001$. The magnitude of magnetization is:
- A$4.5 \times 10^6 \ Am^{-1}$
- B$6.0 \times 10^{-6} \ Am^{-1}$
- C$7.5 \times 10^6 \ Am^{-1}$
- D$9.0 \times 10^6 \ Am^{-1}$
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