Discussion
A specimen in a field intensity of 1000 A/m has a magnetisation of 500 kA/m. Its flux density is about
Answer: D
Correct answer: 0.63 T
\[ B = \mu_0(H+M) = 4\pi\times10^{-7} \times (1000 + 500{,}000) = 1.257\times10^{-6} \times 5.01\times10^{5} = 0.63\ \mathrm{T}. \] The magnetisation exceeds the applied field intensity five hundredfold, so it contributes essentially all the flux density - which is the whole point of a ferromagnetic core, and why omitting \( M \) would give only 1.26 mT.
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