Why is the electric field zero inside the superconductor?

Colt Schmidt asked a question: Why is the electric field zero inside the superconductor?
Asked By: Colt Schmidt
Date created: Thu, Mar 25, 2021 2:52 AM

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Those who are looking for an answer to the question «Why is the electric field zero inside the superconductor?» often ask the following questions:

👉 Why the electric field inside a superconductor is always zero?

In a conventional conductor, the current density and the electric field obey Ohm's Law, J → = σ E →. A perfect conductor, such as a superconductor, is the σ → ∞ limit of this equation; this implies that in this limit, we must have E → → 0 in order to have J → approach a finite limit.

👉 Can electric field exist inside superconductor?

You can have an electric field in a superconductor, but not in a steady state. An electric field will cause a steadily growing current in accordance with the Josephson relations. J = ρ s e ℏ m ∇ θ. and. ℏ ∂ θ ∂ t = − e V ( x). Taking the gradient of the second equation and using the first gives us.

👉 Can a superconductor have an electric field inside it.?

You can have an electric field in a superconductor, but not in a steady state. An electric field will cause a steadily growing current in accordance with the Josephson relations. J = ρ s e ℏ m ∇ θ. and. ℏ ∂ θ ∂ t = − e V ( x).

10 other answers

Because charges arrange themselves in a way such that the electric field due to the arrangement cancels the external electric field, if you can think of this in this way the conductor reaches a sort of equilibrium in the presence of electric field first when the electric field is switched on the electric field inside the conductor is not zero and the charges move due to the electric field and they stop only when electric field inside the conductor is zero.

In a conventional conductor, the current density and the electric field obey Ohm's Law, J → = σ E →. A perfect conductor, such as a superconductor, is the σ → ∞ limit of this equation; this implies that in this limit, we must have E → → 0 in order to have J → approach a finite limit.

If for some reason an electrostatic electrical field does get set up inside a conductor, it will get zeroized very soon, because free electrons will flow, under the Coulomb Forces exerted by the field, to one end of the conductor, leaving the other end of the conductor positively charged.

Superconductor expels magnetic field from theinterior by setting up electric current at the surface.The surface current creates magnetic field thatexactly cancels the external magnetic field! This electric current at the surface of thesuperconductor appears at T

When the temperature decreases below a critical value for many materials, their electrical resistivity drops to zero, and the materials become superconductors (see Superconductors ). Watch this NOVA video excerpt, Making Stuff Colder, as an introduction to the topic of superconductivity and its many applications.

Unlike an ordinary metallic conductor, whose resistance decreases gradually as its temperature is lowered even down to near absolute zero, a superconductor has a characteristic critical temperature below which the resistance drops abruptly to zero. An electric current through a loop of superconducting wire can persist indefinitely with no power source.

The Meissner effect (or Meissner–Ochsenfeld effect) is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state when it is cooled below the critical temperature. This expulsion will repel a nearby magnet. The German physicists Walther Meissner and Robert Ochsenfeld discovered this phenomenon in 1933 by measuring the magnetic field ...

In a superconductor, the electrical resistance unexpectedly drops to zero due to the vibrations & flaws of the atoms must cause resistance within the material while the electrons travel through it 5).

There is another, much more fundamental characteristic whichdistinguishes the superconductor from a normal, but ideal, con-ductor. The superconductor expels magnetic ux, ie., B= 0within the bulk of a superconductor. This is fundamentally dif-ferent than an ideal conductor, for whichB_= 0 since for anyclosed path

In perfect conductors, the interior magnetic field must remain fixed but can have a zero or nonzero value. In real superconductors, all magnetic flux is expelled during the phase transition to superconductivity (the Meissner effect), and the magnetic field is always zero within the bulk of the superconductor. References

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