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Question

If the magnetizing field on a ferromagnetic material is increased, its permeability
  1. Decreased
  2. Increased
  3. Is unaffected
  4. May be increased or decreased

A
Decreased
B
Is unaffected
C
Increased
D
May be increased or decreased
Solution
Verified by Toppr

The magnetic permeability of a substance is defined as
μ=BH
where B is the established magnetic field inside the material,
H is the applied external magnetic field.
When the external applied magnetic field H is increased, the established magnetic field for a ferromagnetic material remains the same. Thus the magnetic permeability decreases.

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