Each atom of an iron bar (5cm×1cm×1cm) has a magnetic moment 1.8×10^−23Am2. Knowing that the density of iron is 7.78×10^3kg−3m, atomic weight is 56 and Avogadro's number is 6.02×10^23 the magnetic moment of bar in the state of magnetic saturation will be

Question:

Each atom of an iron bar (5cm×1cm×1cm) has a magnetic moment 1.8×10⁻²³Am². Knowing that the density of iron is 7.78×10³kgm^-3, atomic weight is 56 and Avogadro’s number is 6.02×10²³ the magnetic moment of bar in the state of magnetic saturation will be

Options :

(a)4.75Am²
(b)5.74Am²
(c)7.54Am²
(d)75.4Am²

Answer :

Ans :- (c)7.54Am²

Answer Steps :

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