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

In summary, the length of an iron bar can theoretically change when it is magnetized because iron is a magnetostrictive ferromagnetic material. The actual measurement of this change depends on various factors such as the size and shape of the bar, the strength of the magnetic field, and more. This change occurs because the iron atoms align with the direction of the magnetic field, resulting in a slight increase in length due to heat and hysteresis. However, with everyday magnets, this change may be too small to be detected without precise instruments.
  • #1
heman
361
0
Does the length of an iron bar changes when it is magnetised?
 
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  • #2
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
Clive,
That' okay but how CAN the length increase.
They are just aligning in the direction of magnetic field.
 
  • #5
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.
 

1. Does the length of an iron bar change when it is magnetized?

Yes, the length of an iron bar can change when it is magnetized.

2. How does magnetization affect the length of an iron bar?

When an iron bar is magnetized, it causes the individual atoms within the bar to align in the same direction. This alignment can cause the bar to either expand or contract, resulting in a change in length.

3. Does the change in length depend on the strength of the magnet?

Yes, the change in length of an iron bar when magnetized is dependent on the strength of the magnet. A stronger magnet will cause a greater change in length compared to a weaker magnet.

4. Can the length of an iron bar return to its original state after being magnetized?

Yes, the length of an iron bar can return to its original state after being magnetized if the magnet is removed. This is because the atoms within the bar will no longer be aligned in the same direction, causing the bar to return to its original length.

5. Is the change in length of an iron bar reversible?

Yes, the change in length of an iron bar when magnetized is reversible. This means that the bar can return to its original length when the magnet is removed.

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