The domain in a ferromagnetic material is in the form of a cube of side $2 \mu m$. The number of atoms in that domain is $9 \times 10^{10}$ and each atom has a dipole moment of $9 \times 10^{-24} A m^2$. The magnetization of the domain is (approximately):

  • A
    $10 \times 10^4 A m^{-1}$
  • B
    $8 \times 10^4 A m^{-1}$
  • C
    $12 \times 10^4 A m^{-1}$
  • D
    $9 \times 10^4 A m^{-1}$

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