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A domain in a ferromagnetic substance is in the form of a cube of side length \( 1 \mu \mathrm{m} \). If it contains \( 8 \times 10^{10} \)
\( \mathrm{P} \) atoms and each atomic dipole has a dipole moment of \( 9 \times 10^{-24} \mathrm{~A} \mathrm{~m}^{2} \), then magnetization of the domain is
W.
(1) \( 7.2 \times 10^{5} \mathrm{~A} \mathrm{~m}^{-1} \)
(2) \( 7.2 \times 10^{3} \mathrm{~A} \mathrm{~m}^{-1} \)
(3) \( 7.2 \times 10^{9} \mathrm{~A} \mathrm{~m}^{-1} \)
(4) \( 7.2 \times 10^{12} \mathrm{~A} \mathrm{~m}^{-1} \)
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