Medium
Explain hard ferromagnetic and soft ferromagnetic materials.
(N/A) Hard ferromagnetic materials: In some ferromagnetic materials,the magnetization persists even after the removal of the external magnetic field. Such materials are called hard magnetic materials.
Alnico,an alloy of iron,aluminum,nickel,cobalt,and copper,is one such material. Naturally occurring lodestone is also a hard ferromagnetic material. Its relative permeability is $> 1000$.
Such materials are used to form permanent magnets,for example,in compass needles.
Soft ferromagnetic materials: There are some ferromagnetic materials in which the magnetization disappears upon the removal of the external magnetic field. These materials are called soft magnetic materials.
These materials are used in electric bells,cranes,transformers,etc.
Alnico,an alloy of iron,aluminum,nickel,cobalt,and copper,is one such material. Naturally occurring lodestone is also a hard ferromagnetic material. Its relative permeability is $> 1000$.
Such materials are used to form permanent magnets,for example,in compass needles.
Soft ferromagnetic materials: There are some ferromagnetic materials in which the magnetization disappears upon the removal of the external magnetic field. These materials are called soft magnetic materials.
These materials are used in electric bells,cranes,transformers,etc.
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Similar Questions
Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$. Consider a ferromagnetic material:
Assertion $(A)$: The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains.
Reason $(R)$: At high enough temperature, the domain structure of a ferromagnetic material disintegrates. Thus, magnetization will disappear at a high enough temperature known as the Curie temperature.
In the light of the above statements, choose the correct answer from the options given below:
Assertion $(A)$: The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains.
Reason $(R)$: At high enough temperature, the domain structure of a ferromagnetic material disintegrates. Thus, magnetization will disappear at a high enough temperature known as the Curie temperature.
In the light of the above statements, choose the correct answer from the options given below:
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