Answer
Verified
44.7k+ views
Hint: Before discussing the variation of the permeability with the magnetizing field on a ferromagnetic material, we should briefly discuss ferromagnetic materials and permeability. Permeability in general refers to the tendency of a region to be penetrated or infiltrated by fluids. Magnetic permeability is the ratio of the magnetic induction to the magnetic intensity and supports the formation of a magnetic field. Ferromagnetic substances tend to develop a strong magnetic field when placed in an external magnetic field. Having discussed the basic terminology of the question, let’s head over to the detailed solution.
Formula Used: \[\mu =\dfrac{B}{H}\]
Complete step by step solution:
As discussed above, we know that the magnetic field developed inside a ferromagnetic material depends on the externally applied field and must vary as the external field is varied. On the surface of the earth, the earth’s magnetic field acts as the external magnetic field that induces magnetism in a ferromagnetic material.
The mathematical formula of permeability states that it is a ratio of the magnetic field density to the magnetic field strength, that is
Permeability \[(\mu )=\dfrac{B}{H}\] where \[B\] is the magnetic field density and \[H\] is the magnetic field strength.
From the expression given, we can say that magnetic permeability is inversely proportional to the magnetic field strength.
Hence we can say that the permeability decreases as the magnetizing field on a ferromagnetic substance is increased.
Therefore, option (A) is the correct answer to the given question.
Note:
The magnetic permeability of material also tells us of the material’s ability to get magnetized or the material’s resistance to the applied magnetic field. Hence ferromagnetic materials are often used to form permanent magnets as they can support a large amount of magnetic flux passing through them.
Formula Used: \[\mu =\dfrac{B}{H}\]
Complete step by step solution:
As discussed above, we know that the magnetic field developed inside a ferromagnetic material depends on the externally applied field and must vary as the external field is varied. On the surface of the earth, the earth’s magnetic field acts as the external magnetic field that induces magnetism in a ferromagnetic material.
The mathematical formula of permeability states that it is a ratio of the magnetic field density to the magnetic field strength, that is
Permeability \[(\mu )=\dfrac{B}{H}\] where \[B\] is the magnetic field density and \[H\] is the magnetic field strength.
From the expression given, we can say that magnetic permeability is inversely proportional to the magnetic field strength.
Hence we can say that the permeability decreases as the magnetizing field on a ferromagnetic substance is increased.
Therefore, option (A) is the correct answer to the given question.
Note:
The magnetic permeability of material also tells us of the material’s ability to get magnetized or the material’s resistance to the applied magnetic field. Hence ferromagnetic materials are often used to form permanent magnets as they can support a large amount of magnetic flux passing through them.
Recently Updated Pages
To get a maximum current in an external resistance class 1 physics JEE_Main
f a body travels with constant acceleration which of class 1 physics JEE_Main
A hollow sphere of mass M and radius R is rotating class 1 physics JEE_Main
If the beams of electrons and protons move parallel class 1 physics JEE_Main
Two radioactive nuclei P and Q in a given sample decay class 1 physics JEE_Main
silver wire has diameter 04mm and resistivity 16 times class 12 physics JEE_Main
Other Pages
when an object Is placed at a distance of 60 cm from class 12 physics JEE_Main
If a wire of resistance R is stretched to double of class 12 physics JEE_Main
The resultant of vec A and vec B is perpendicular to class 11 physics JEE_Main
Explain the construction and working of a GeigerMuller class 12 physics JEE_Main
Electric field due to uniformly charged sphere class 12 physics JEE_Main