Magnetic field in perfect conductor

In summary, a perfect conductor is a material that allows electric current to flow through it with zero resistance. This results in no loss of energy and the creation of a circular magnetic field when current flows through it. A perfect conductor can also shield and confine magnetic fields, making it useful in devices like electromagnets. While no material can be considered a perfect conductor, superconductors come close at very low temperatures.
  • #1
paweld
255
0
Why in perfect conductor magnetic field B vanishes? It's often assumed while
considering wave guides.
 
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  • #2
Induced currents equal to the magnetic field flow on the exterior of the perfect conductor and prevent the field from extending into the conductor.
 
  • #3
Only oscillating magnetic fields vanish in a perfect conductor.
A static magnetic field is possible.
 
  • #4
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.
 
  • #5


In a perfect conductor, the movement of electrons is unrestricted, allowing for the immediate cancellation of any external magnetic field. This is known as the Meissner effect, where the perfect conductor becomes diamagnetic and expels any external magnetic fields. Therefore, in a perfect conductor, the magnetic field (B) will always vanish. This phenomenon is crucial to consider when designing and analyzing wave guides, as any remaining magnetic field could interfere with the desired propagation of electromagnetic waves.
 

1. What is a perfect conductor?

A perfect conductor is a material that allows electric current to flow through it with zero resistance. This means that there is no loss of energy as the current moves through the material.

2. How is a magnetic field created in a perfect conductor?

A magnetic field is created in a perfect conductor when an electric current flows through it. As the current moves, it creates a circular magnetic field around it due to the flow of electrons.

3. What is the relationship between a magnetic field and a perfect conductor?

A perfect conductor is able to shield or block external magnetic fields due to its ability to conduct electric current without resistance. This is known as the Meissner effect, where the magnetic field lines are expelled from the interior of the perfect conductor.

4. How does a perfect conductor affect the behavior of a magnetic field?

A perfect conductor has the ability to confine and guide magnetic fields due to its high electrical conductivity. This can be seen in devices like electromagnets, where a perfect conductor is used to create a strong and controlled magnetic field.

5. Can a perfect conductor exist in real life?

There is no material that can be considered a perfect conductor, as all materials have some level of resistance to electric current. However, some materials, such as superconductors, come close to being perfect conductors at very low temperatures.

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