Gadolinium sulphate obeys Langevin's theory of paramagnetism down to a few degrees Kelvin. Its molecular magnetic moment is \(7.2 \times 10^{-23} \mathrm{amp}-\mathrm{m}^{2}\). Determine the degree of magnetic saturation in this salt at a temperature of \(2 \mathrm{~K}\) in a field of flux density 2 weber \(/ \mathrm{m}^{2}\).