The magnetic moment product in a sample of 2 gram is $8 \times 10^{-7} \mathrm{Am}^2$. If its density is $4…
The magnetic moment product in a sample of 2 gram is $8 \times 10^{-7} \mathrm{Am}^2$. If its density is $4 \mathrm{~g} / \mathrm{cm}^3$ then the magnetization of the sample in $\mathrm{Am}^{-1}$ is
1.6
1.8
1.2
1.4
Solution
Volume of the sample $V=\frac{\text { mass }}{\text { density }}=\frac{2}{4} \mathrm{~cm}^3=0.5 \times 10^{-6} \mathrm{~m}^3$
$\text { Magnetization }=\frac{\text { Megnetic moment }}{\text { Volume }}=\frac{8 \times x 10^{-7}}{0.5 \times 10^{-6}} \mathrm{~A} / \mathrm{m}=1.6 \mathrm{~A} / \mathrm{m}$