Magnetic properties of matterMedium
Question
The number of atoms per unit volume in a sample of iron is 9 × 1028 atoms/m3. The magnetic moment of every iron atom is 1.5 × 10-23 A-m2. If all the dipoles are aligned in a domain due to ferromagnetic interaction, then the intensity of magnetisation of an iron rod of length 10 cm and area of cross section 1 cm2 will be :-
Options
A.1.8 × 106 A/m
B.1.31 × 105 A/m
C.1.35 × 106 A/m
D.1.4 × 104 A/m
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