A domain in a ferromagnetic substance is in the form of a cube of side length\[1\mu m\]. If it contains \[8\times {{10}^{10}}\] atoms and each atomic dipole has a dipole moment of \[9\times {{10}^{-24}}\,A\,,{{m}^{2}}\], then the magnetization of the domain is

\[7.2\times {{10}^{3}}\,A\,{{m}^{-1}}\]

\[7.2\times {{10}^{5}}\,A\,{{m}^{-1}}\]

\[7.2\times {{10}^{9}}\,A\,{{m}^{-1}}\]

\[7.2\times {{10}^{12}}\,A\,{{m}^{-1}}\]

A domain in a ferromagnetic substance is in the form of a cube of side

1.	A domain in a ferromagnetic substance is in the form of a cube of side length\[1\mu m\]. If it contains \[8\times {{10}^{10}}\] atoms and each atomic dipole has a dipole moment of \[9\times {{10}^{-24}}\,A\,,{{m}^{2}}\], then the magnetization of the domain is
A.	\[7.2\times {{10}^{5}}\,A\,{{m}^{-1}}\]
B.	\[7.2\times {{10}^{3}}\,A\,{{m}^{-1}}\]
C.	\[7.2\times {{10}^{9}}\,A\,{{m}^{-1}}\]
D.	\[7.2\times {{10}^{12}}\,A\,{{m}^{-1}}\]
Answer» B. \[7.2\times {{10}^{3}}\,A\,{{m}^{-1}}\]