How the currernt in a superconductor is limited?

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Discussion Overview

The discussion revolves around the limitations of current in superconductors, exploring concepts related to resistance, loads, and the implications of the Meissner effect. Participants engage in a mix of theoretical and conceptual inquiries regarding the behavior of current in superconducting materials.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that current in a superconductor is limited by resistance or external loads, while others argue that without any load, the current can increase indefinitely.
  • There is a contention regarding the implications of infinite current, with some asserting it contradicts the law of conservation of energy, while others maintain that no power is dissipated without a load, allowing current to rise.
  • A participant introduces the concept of the critical magnetic field, stating that exceeding this field would destroy the superconducting phase.
  • Questions arise about the definition and implications of the critical magnetic field and the Meissner-Ochsenfeld effect.
  • One participant claims that the current remains constant once induced by an external power source, suggesting it does not fluctuate from that initial value.

Areas of Agreement / Disagreement

Participants express differing views on the limitations of current in superconductors, with no consensus reached on whether current can be infinite or remains constant after induction. The discussion includes both supportive and opposing arguments regarding the implications of superconductivity and related effects.

Contextual Notes

Some claims depend on specific definitions of loads and resistance, and there are unresolved questions regarding the critical magnetic field and its effects on superconductivity.

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How the currernt in a superconductor is limited?
 
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By resistance or some other kind of load.

And if there isn't one, there's no limit.
 


Jiggy-Ninja said:
By resistance or some other kind of load.

And if there isn't one, there's no limit.

You mean there is infinite current? that contradicts law of conservation of energy.
 


djsourabh said:
You mean there is infinite current? that contradicts law of conservation of energy.
No it doesn't. If there's no load of any kind, there's no power being dissipated by the superconductor, so the current keeps climbing higher. The energy from the source is put into the kinetic energy of the electrons.
 


So do you know any formula for calculating amount of current through a superconductor?
 


A flowing current creates a magnetic field. The magnetic field cannot be larger than the critical magnetic field, because it destroys the superconducting phase.
 


What do you mean by critical magnetic field?
 


Have you ever heard about the Meissner-Ochsenfeld effect?
 


help!
 
  • #10


what is your level of Physics education?
 
  • #11


nothing about Q mechanics!
only know basic engineering physics.
 
  • #12


do you know electromagnetism?
 
  • #13


of course! law & applications in ac & dc machines!
 
  • #14


The current is started by an external power source, so the current would remain the same as that which was originally induced in the superconductor.

It would not increase or decrease from that original value.
 

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