Magnetization of a solenoid's core from turns per metre, current and relative permeability

1. A.
   $6 \times 10^5$
2. B.
   $6 \times 10^4$
3. C.
   $8 \times 10^5$
4. D.
   $8 \times 10^4$

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1. A.
   $4.5\times10^6\,A\,m^{-1}$
2. B.
   $6.0\times10^6\,A\,m^{-1}$
3. C.
   $7.5\times10^6\,A\,m^{-1}$
4. D.
   $9.0\times10^6\,A\,m^{-1}$

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