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In an iron bar (5 x 1 x 1) cm^3 magnetic...

In an iron bar (5 x 1 x 1) `cm^3` magnetic moment of an atom is 1.8 x `10^-23` `Am^2`. What is magnetic moment of the bar magnet in the state of saturation ? (Density =7.8 x `10^3` `(kg)/m^3` atomic mass =56 gm)

A) 6.54 `Am^2`

B) 7.54 `Am^2`

C) 4.54 `Am^2`

D) 3.54 `Am^2`

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