# Magnetic field behind superconductors

• losbellos
In summary, the conversation discusses the ability to calculate the magnetic field behind a superconductor and the possibility of using a superconductor plate to shield the magnetic field. The strength of the magnetic field above the superconductor is also mentioned, along with the significance of the force of moving a superconductor plate between two magnetic fields. The conversation concludes with a reference to a website discussing the shielding effectiveness of superconductors.
losbellos
Hej Guys,

Is there a way to calculate the magnetic field behind a superconductor? I mean the model is like some simple block magnet and a bigger superconductor plate to try to shield the magnetic field. How strong the magnetic field would be above(behind) the SC?

B, H is given.

Also is the force of moving out an SC plate in between two magnetic field is significant? Dependent on polarity or not?

Thank you!

Not my field really. I couldn't google exactly what you asked but perhaps as an example see..

http://www.can-superconductors.com/magnetic-shields.html

Shielding effectiveness (77 K, amplitude 2 mT, frequency 20 Hz – 10 kHz)
> 120 dB

## 1. What is a superconductor?

A superconductor is a material that can conduct electricity with zero resistance when cooled below a certain temperature, known as the critical temperature. This allows for the creation of extremely strong magnetic fields, making them useful in various scientific and technological applications.

## 2. How does a magnetic field form behind a superconductor?

When a superconductor is cooled below its critical temperature, it expels any magnetic fields that pass through it, creating a perfect diamagnet. This means that the magnetic field lines are forced to travel around the superconductor, creating a strong magnetic field behind it.

## 3. What is the Meissner effect?

The Meissner effect is the phenomenon where a superconductor expels all magnetic fields from its interior when it is cooled below its critical temperature. This results in a perfect diamagnet, as no magnetic fields are able to penetrate through the material.

## 4. How does the strength of the magnetic field behind a superconductor compare to other magnets?

The strength of the magnetic field behind a superconductor can be much stronger than a traditional magnet due to the perfect diamagnetism of the material. This means that no magnetic fields are able to pass through the superconductor, resulting in a concentrated and strong magnetic field behind it.

## 5. What are the practical applications of the magnetic field behind superconductors?

The strong magnetic field behind superconductors has a wide range of applications, including in medical imaging technologies such as MRI machines, in particle accelerators, and in levitating trains. It also has potential uses in energy storage and transportation, as well as in scientific research and experiments.

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