Can I make an electromagnet attract to either pole of a mag?

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An electromagnet can be manipulated to attract either pole of a permanent magnet by reversing the current direction. The design of the electromagnet, particularly the configuration of its poles, affects its holding strength. To optimize attraction to both N and S poles, an extension piece on the center pole may be necessary to enhance its reach. Alternatively, modifying the electromagnet by removing the outer return cylinder could also improve its functionality. Proper adjustments can significantly enhance the electromagnet's performance in attracting different magnetic poles.
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Can an electromagnet like this one be manipulate to attract either pole of a permanent magnet by running the current in either direction?

http://www.ebay.com/itm/Metal-11LB-5kg-0-5A-Electric-Lifting-Magnet-Holding-Electromagnet-9V-DC-50N-/161550273936?pt=LH_DefaultDomain_0&hash=item259d258d90
 
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radaballer said:
Can an electromagnet like this one be manipulate to attract either pole of a permanent magnet by running the current in either direction?

http://www.ebay.com/itm/Metal-11LB-5kg-0-5A-Electric-Lifting-Magnet-Holding-Electromagnet-9V-DC-50N-/161550273936?pt=LH_DefaultDomain_0&hash=item259d258d90

Yep! :smile:
 
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berkeman said:
Yep! :smile:

Actually, I need to modify my answer...

If you look at the alternate images you will see the "holding end" of the electromagnet. To make the strongest holding force, they bring both poles of the electromagnet out on that end, with a center pole an an outer pole that have opposite N/S on them. That way when you attach it to a ferrous metal plate, the magnetic path length through the air is minimized.

So, if you want to be able to attract a N or S pole with this, you would do best to put an extension piece on the center pole, to get it away from the outer return cylinder. Or you may be able to take it apart and remove the outer return cylinder.

Makes sense?
 
berkeman said:
Actually, I need to modify my answer...

If you look at the alternate images you will see the "holding end" of the electromagnet. To make the strongest holding force, they bring both poles of the electromagnet out on that end, with a center pole an an outer pole that have opposite N/S on them. That way when you attach it to a ferrous metal plate, the magnetic path length through the air is minimized.

So, if you want to be able to attract a N or S pole with this, you would do best to put an extension piece on the center pole, to get it away from the outer return cylinder. Or you may be able to take it apart and remove the outer return cylinder.

Makes sense?
Yes, thank you
 
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Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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