Strength of magnetic field on "eBay electromagnets"?

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SUMMARY

The discussion centers on the strength of magnetic fields produced by powerful electromagnets available on eBay, specifically those capable of lifting approximately 100 kg. It is established that permanent magnets typically do not exceed a couple of Tesla in strength. The lifting force of an electromagnet is more accurately assessed through its total dipole moment rather than surface magnetic field strength. The conversation emphasizes the importance of understanding the relationship between magnetic field area and lifting force.

PREREQUISITES
  • Understanding of electromagnet principles
  • Familiarity with magnetic field strength measurements (Tesla)
  • Knowledge of lifting force calculations for magnets
  • Basic grasp of dipole moments in magnetic fields
NEXT STEPS
  • Research the specifications of electromagnets on eBay, focusing on lifting capacities
  • Study the relationship between magnetic field area and lifting force
  • Learn about the total dipole moment and its relevance in electromagnet performance
  • Examine the Wikipedia entry on electromagnets for foundational knowledge
USEFUL FOR

Engineers, hobbyists, and anyone interested in the practical applications of electromagnets, particularly those evaluating lifting capabilities for industrial or DIY projects.

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
 
Last edited:
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