The magnetic moment of the Earth is approximately 8.00 x 1022 A (m2.
(a) If this were caused by the complete magnetization of a huge iron deposit, how many unpaired electrons would this correspond to?
(b) At two unpaired electrons per iron atom, how many kilograms of iron would this correspond to? (Iron has a density of 7 900 kg/m3, and approximately 8.50 x 1028 iron atoms/m3)