Does the length of an iron bar changes when it is magnetised?

  • Thread starter heman
  • Start date
  • #1
349
0

Main Question or Discussion Point

Does the length of an iron bar changes when it is magnetised?
 

Answers and Replies

  • #2
119
0
Theoretically yes, because iron is a magnetostrictive ferromagnetic material. The experimental measurement of this variation depends on your setup (iron bar size&shape, magnetic field strength, etc.).
 
  • #3
349
0
Clive,
That' okay but how CAN the length increase.
They are just aligning in the direction of magnetic field.
 
  • #5
73
0
Let's see now. To magnetize iron you have to pass it through the field lines. Doing so generates an electrical current. Current meets resistance, generates heat, hysteresis. When you heat something what happens?
Mind you, with every day magnets, the effect could be so small that it would be undetectable without some veery precise instruments.
 

Related Threads on Does the length of an iron bar changes when it is magnetised?

  • Last Post
Replies
3
Views
7K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
10
Views
28K
Replies
6
Views
1K
  • Last Post
Replies
1
Views
2K
Replies
1
Views
188
Replies
14
Views
11K
Replies
17
Views
15K
Replies
3
Views
961
Top