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A domain in a ferromagnetic material (...

A domain in a ferromagnetic material (iron ) is in the form of a cube of side length 1 `mu` The dipole moment of the domain when all the atomic dipoles get perfectly aligned is `5xx10^(-12) Am^(2)` what is the intensity of magnetisation of the domain in this situation ?

A

`10^(4)`

B

`10^(5)`

C

`2xx10^(6)`

D

`3xx10^(5)`

Text Solution

Verified by Experts

The correct Answer is:
D
Each side of the domain cube (l)=1 `mu m =10^(-6) m`
`therefore` volume of the domain =`V=l^(3)=(10^(-6))^(3)=10^(-18)m^(3)`
`therefore I =(M)/(V)=(5xx10^(-12))/(10^(-18))=5xx10^(6) A/m`
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