LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in General by (30.0k points)
closed by
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

1 Answer

0 votes
by (54.3k points)
selected by
Best answer
Correct Answer - Option 3 : Small changes in its dimension


  • 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.


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

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.