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When a Ferromagnetic material is magnetized by alternating source voltage. The phenomenon of magnetostriation causes:
1. Increase in the body temperature
2. Change in permeability of the material
3. Small changes in its dimension
4. Decrease in the saturation flux density

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Correct Answer - Option 3 : Small changes in its dimension

Magnetostriction:

  • When a magnetic field is given to a magnetic material, it experiences an alteration in shape, or size, or length, or dimension. This property of some magnetic materials is known as magnetostriction.
  • This change of dimension of magnetic materials during magnetization may continue till the magnetic saturation of the material is attained.
  • This effect is the reason for the humming sound that we hear in the transformer.


Formula:

Magnetostriction can be calculated by the magnetostriction coefficient or Joule’s magnetostriction coefficient (λ).

λ = ∂ L / L

L = Length of the ferromagnetic material

∂ L = Change in the length of the material

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