Magnetic field in perfect conductor

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Discussion Overview

The discussion revolves around the behavior of magnetic fields in perfect conductors, particularly in the context of waveguides. Participants explore the conditions under which magnetic fields are said to vanish and the distinctions between perfect conductors and superconductors.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why the magnetic field B is assumed to vanish in perfect conductors, particularly in waveguide scenarios.
  • Another participant suggests that induced currents on the exterior of a perfect conductor prevent the magnetic field from penetrating into the conductor.
  • Some participants assert that only oscillating magnetic fields vanish in a perfect conductor, while static magnetic fields can exist.
  • There is a clarification that superconductors differ from perfect conductors, with superconductors exhibiting a unique set of properties that lead to different behaviors regarding magnetic fields.

Areas of Agreement / Disagreement

Participants express differing views on the nature of magnetic fields in perfect conductors, particularly regarding the distinction between oscillating and static fields. There is no consensus on the complete characterization of magnetic field behavior in these materials.

Contextual Notes

Some assumptions about the definitions of perfect conductors and superconductors may not be fully articulated, and the discussion does not resolve the implications of these distinctions on magnetic field behavior.

paweld
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Why in perfect conductor magnetic field B vanishes? It's often assumed while
considering wave guides.
 
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Induced currents equal to the magnetic field flow on the exterior of the perfect conductor and prevent the field from extending into the conductor.
 
Only oscillating magnetic fields vanish in a perfect conductor.
A static magnetic field is possible.
 
clem said:
Only oscillating magnetic fields vanish in a perfect conductor.
A static magnetic field is possible.

But not in super conductors. However, super conductors have a slightly different set of properties than perfect conductors but I have seen people confuse the two.
 

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