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Question

Magnetic permeability is maximum for


A

diamagnetic substances

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B

paramagnetic substances

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C

ferromagnetic substances

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D

all of these

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Solution

The correct option is C

ferromagnetic substances


The explanation for correct option:

1. The relationship between permeability μ and magnetic susceptibility χm is given as

μ=μ01+χm

where μ0 is the permeability of free space.

2. For free space χm=0 and μ=μ0.

3. The quantity μr=μμ0=1+χm is called relative permeability.

Option (C):

  1. For ferromagnetic substances, the magnetic susceptibility is much greater than one.
  2. Therefore, their permeability is very high for such materials.

The explanation for Incorrect Option:

Option (A):

  1. For diamagnetic substances, the magnetic susceptibility is less than zero.
  2. Therefore, their permeability is very close to unity for such materials.

Option (B):

  1. For paramagnetic substances, the magnetic susceptibility is of the order of 10-5.
  2. Therefore, their permeability is very close to unity for such materials.

Option (D):

  1. Since two options are incorrect, all of these cannot be the correct option.

Hence, the correct answer is option (C).


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