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A solenoid has core of a material with relative permeability 400 . The windings of the solenoid are insulated from the core and carry a current of \( 2 \mathrm{~A} \).
If the number of turns is 1000 per metre, calculate \( H \) and \( M \).
(a) \( 2 \times 10^{3} \mathrm{Am}^{-1}, 8 \times 10^{5} \mathrm{Am}^{-1} \)
(b) \( 1.0 \mathrm{Am}^{-1}, 1.5 \times 10^{5} \mathrm{Am}^{-1} \)
(c) \( 6.8 \times 10^{-5} \mathrm{Am}^{-1}, 1.2 \times 10^{-5} \mathrm{Am}^{-1} \)
(d) \( 2.1 \times 10^{-4} \mathrm{Am}^{-1},-2.6 \times 10^{5} \mathrm{Am}^{-1} \)
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