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A domain in ferromagnetic iron is in the form of a
P cube of side length \( 1 \mu \mathrm{m} \). Estimate the number of iron

W atoms in the domain and the maximum possible dipole moment and find out magnetization of the domain. (The molecular mass of iron is \( 55 \mathrm{~g} / \mathrm{mole} \) and its density is \( 7.9 \mathrm{~g} / \mathrm{cm}^{3} \). Assume that each iron atom has a dipole moment of \( 9.27 \times 10^{-24} \mathrm{Am}^{2} \).)
(1) \( 7.0 \times 10^{5} \mathrm{Am}^{-1} \)
(2) \( 8.0 \times 10^{5} \mathrm{Am}^{-1} \)
(3) \( 9.0 \times 10^{5} \mathrm{Am}^{-1} \)
(4) \( 10.0 \times 10^{5} \mathrm{Am}^{-1} \)
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