Strength of magnetic field on "eBay electromagnets"?

AI Thread Summary
The discussion centers on the strength of magnetic fields produced by powerful electromagnets available on eBay, particularly those capable of lifting around 100 kg. It highlights that permanent magnets typically do not exceed a couple of Tesla in strength and emphasizes that lifting force is better measured by total dipole moment rather than surface magnetic field strength. The conversation suggests that the original question lacks specificity, prompting a request for links to the specific electromagnets in question. Additionally, participants recommend consulting external resources, such as Wikipedia, for more detailed information on electromagnets. Overall, understanding the metrics for evaluating electromagnet strength is crucial for accurate assessments.
Sven Andersson
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How strong, approximately, is the magnetic field, on a powerful electromagnet, that you buy on eBay, that can lift, say, a 100 kg?
 
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Hard to say. It is uncommon for permanent magnets to exceed a couple Tesla. Force is increased by increasing the area over which the magnetic field is applied, not by increasing the magnetic field itself, due to material limitations.

For big magnets, lifting force or total dipole moment is a more reasonable metric than field strength at the surface.
 
Dr. Courtney said:
It is uncommon for permanent magnets to exceed a couple Tesla. Force

he's referring to electromagnets

Sven Andersson said:
How strong, approximately, is the magnetic field, on a powerful electromagnet, that you buy on eBay, that can lift, say, a 100 kg?

Sven, your Q is very vague ... how about a link to the eBay electromagnets in question

and whilst doing that, have a look at the wiki entry on electromagnets ...
https://en.wikipedia.org/wiki/Electromagnet

Dave
 
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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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