A domain in ferromagnetic iron is in the form of a cube of side length \(1\) µm. The maximum possible dipole moment is:
[The molecular mass of iron is \(55\) g/mole and its density is \(7.9\) g/cm³. Assume that each iron atom has a dipole moment of \(9.27\times 10^{-24}\) Am²]
1. \(8.0\times10^{-13}\) Am²
2. \(8.0\times10^{-12}\) Am²
3. \(7.0\times10^{-13}\) Am²
4. \(7.0\times10^{-12}\) Am²

A domain in ferromagnetic iron is in the form of a cube of side length \(1~\mu \text{m}\). The magnetisation of the domain is:
( The molecular mass of iron is \(55~\text{g/mole}\) and its density is \(7.9~\text{g/cm}^3\) . Assume that each iron atom has a dipole moment of \(9.27\times 10^{-24}~\text{Am}^2\))
1. \(9.0 \times 10^5~\text{Am}^{-1}\)
2. \(8.0 \times 10^5~\text{Am}^{-1}\)
3. \(11 \times 10^5~\text{Am}^{-1}\)
4. \(3.0 \times 10^5~\text{Am}^{-1}\)