Superconductors, ElectroMagnets and MagLevs

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SUMMARY

This discussion centers on the applications of superconductivity, specifically in MagLev trains, and the confusion surrounding the Meissner Effect. Superconductors exhibit perfect diamagnetism, which leads to the expulsion of magnetic fields, yet they can also function as electromagnets. The key distinction lies in the behavior of superconductors as solenoid coils, where high current generates an external magnetic field without internal magnetic poles. This understanding clarifies how superconducting magnets operate despite their inherent properties.

PREREQUISITES
  • Understanding of superconductivity and its principles
  • Knowledge of the Meissner Effect
  • Familiarity with electromagnetism and solenoid coils
  • Basic concepts of magnetic fields and diamagnetism
NEXT STEPS
  • Research the Meissner Effect in detail and its implications for superconductors
  • Explore the design and functioning of superconducting magnets
  • Learn about the applications of MagLev technology in transportation
  • Investigate the differences between superconductors and traditional electromagnets
USEFUL FOR

Students, researchers, and professionals in physics and engineering, particularly those interested in superconductivity, electromagnetism, and transportation technologies like MagLev trains.

DarkLeviathan
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Guys I have a problem. Maybe, it's is a stupid one, but I really need help to comprehend something.

I'm writing a report about applications of superconductivity. I chose the MagLev trains applications. Let's say, everything was fine until I read about the Meissner Effect. Now I have my mind puzzled.

So, correct me if I'm wrong: Superconductors are "perfect" diamagnets, and diamagnets and Meissner effect are supossed to reject any magnetic field inside of them and thus creating a repulsive effect... How is possible to create superconductors magnets? Shouldn't they reject every magnet no matter its poles? Are superconducting magnet's poles placed in the opposite sides of the superconductor's surface but not in inside?

Please answer that doubt, I'm beginning to lose my nerves.
 
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As I understand it, it`s because Superconductors are electromagnets. They act like a solenoid coil and not like a bar magnetic. That is, the high current produces a magentic field outside the coil but there are no poles "inside" or "on" the coil itself.
 

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