A domain in ferromagnetic iron is in the form of a cube of side length 2μ m then the number of iron atoms in the domain are (Molecular mass of iron = 55gmol−1 and density = 7.92gcm−3), maximum value of magnetisation of the given domain is (Dipole moment of an iton atom 9.27×10−24Am2)
8.0×105Am−1
6.0×104Am−1
8.0×103Am−1
6.0×103Am−1
A
8.0×105Am−1
B
6.0×104Am−1
C
8.0×103Am−1
D
6.0×103Am−1
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Solution
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Net dipole moment, MN=N×m=6.92×1011×9.27×10−24=6.4×10−12Am2 Net magnetisation =6.4×10−128×10−18=8×105Am−1
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