# Electric field in super conductor

• spidey
In summary, a superconductor is a material that can conduct electricity without any resistance at very low temperatures. The electric field is completely expelled from a superconductor due to the Meissner effect, and it cannot exist within the material. An external electric field can disrupt the superconducting state by creating a persistent current, and this phenomenon is utilized in various applications such as magnetic levitation and efficient electrical transmission lines.
spidey
Is E=0 in super conductor also? I read in the below site that static electric field goes some depth into super conductor? Is this true? Classical physics says E=0 in conductor. so, what is the difference ordinary conductors and super conductors?

In an ideal conductor, there is no electric field. Same for a superconductor. Physical (super-)conductors are more complex. For example, you have a "skin" where there are a lot more dynamics than the bulk.

Many Thanks..

## 1. What is a superconductor?

A superconductor is a material that is able to conduct electricity with zero resistance, meaning that there is no energy lost as heat during the flow of electrons. This phenomenon is observed at very low temperatures, typically below -200 degrees Celsius.

## 2. How does an electric field behave in a superconductor?

In a superconductor, the electric field is completely expelled from the material. This is due to the Meissner effect, where the superconductor creates opposing magnetic fields to cancel out the external magnetic field, resulting in no electric field inside the material.

## 3. Can an electric field be present in a superconductor?

No, an electric field cannot exist within a superconductor. The expulsion of the electric field is a fundamental property of superconductors and is a result of the perfect conductivity of the material.

## 4. How does the electric field affect the superconducting state?

The presence of an external electric field can disrupt the superconducting state by creating a flow of current known as the persistent current. This current can cause the superconductor to lose its zero resistance and return to a normal conducting state.

## 5. What applications use the electric field in superconductors?

The expulsion of the electric field in superconductors is utilized in various applications such as magnetic levitation in trains, high-speed particle accelerators, and MRI machines. Superconducting materials are also used in the construction of highly efficient electrical transmission lines.

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