The nail is steel - not iron.
The core became a magnet
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7th February 2012 01:02 AM #1atferrari
The core became a magnet
To experiment in repelling a magnet I winded a 3-layers inductor around a piece of a common nail (soft-iron?)
Initially it seemed to work OK but later I found that, after cutting the current, the magnet was atracted by the core which started to behave as a magnet. Not what I wanted, precisely.
Just to be sure I verified that a paper clip is attracted by the core.
I did not foreseen that. How to avoid it? Not using a core? Or is this the wrong material?
Now that I think of it this would be good if I wanted to attract the magnet. But I want just the opposite.Agustín Tomás
In theory, there is no difference between theory and practice. In practice, however, there is.
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7th February 2012 05:09 AM #2colin55
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7th February 2012 07:39 AM Thread Starter #3atferrari
Hola Colin,
If so, what could be a good material (that I could find easily around) serving as a core and not being converted into a magnet?
I am afraid that there is no any and I will have to build a really big solenoid.0Agustín Tomás
In theory, there is no difference between theory and practice. In practice, however, there is.
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7th February 2012 08:23 AM #4Nigel Goodwin
Super ModeratorIt's not 'soft' - to use a nail in this way (a common school experiment) you need to 'soften' it - simply heat it until red hot, then let it slowly cool down, this will 'soften' it.
Originally Posted by atferrari
I did this with my daughter when she was at primary school
0PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
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7th February 2012 08:36 AM Thread Starter #5atferrari
Hola Nigel.
After softening them like that, should I still expect some residual magnetism after use?
Not able to try it right now.0Agustín Tomás
In theory, there is no difference between theory and practice. In practice, however, there is.
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7th February 2012 09:56 AM #6MrAl
Hi,
To reduce the stored field of a material you do what is normally referred to as degaussing. This involves using an AC generated field that slowly decreases to excite the object to be demagnetized. As the AC field takes the object through its hysteresis loop and slowly decreases it takes the objects field with it and it becomes demagnetized.0One test is worth a thousand expert opinions, but one expert specification is worth a thousand tests.
If i miss something you posted or something you think is important, feel free to PM me.
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7th February 2012 10:01 AM #7colin55
Use a ferrite rod from the aerial coil of a transistor radio
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7th February 2012 11:30 AM #8Nigel Goodwin
Super ModeratorVery little. Originally Posted by atferrari
0PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
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7th February 2012 11:33 AM #9Nigel Goodwin
Super ModeratorWill that work as a core for an electro magnet? - I've never tried it, or heard of anyone who has. Originally Posted by colin55
0PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
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7th February 2012 12:18 PM #10colin55
He has asked for a material that will not have or produce any residual magnetism. A nail is steel and has a completely different magnetic dipole structure than Stalloy or other magnetic material used for DC electromagnets. Annealing a nail does not make it "soft iron." It simply anneals it.
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