16 Questions
What is the Meissner effect?
The expulsion of a magnetic field from a superconductor during its transition to the superconducting state
Who discovered the Meissner effect?
Walther Meißner and Robert Ochsenfeld
What will happen to a nearby magnet when the Meissner effect occurs?
It will be repelled by the superconductor
What happens to the interior magnetic fields of superconducting tin and lead samples during the Meissner effect?
They cancel nearly all interior magnetic fields
What is the nature of equilibrium that determines the ability for the expulsion effect in a superconductor?
Neutralization within the unit cell of a superconductor
When does the Meissner state break down?
When there is an increase in exterior magnetic field
What happens when the strength of the applied field rises above a critical value in type-I superconductors?
Superconductivity is abruptly destroyed
What occurs at a second critical field strength Hc2 in type-II superconductors?
Superconductivity is destroyed
What is the name given to the electric current-induced motion of flux vortices in some type-II superconductors?
Fluxons
What does the London equation predict about the magnetic field in a superconductor?
It decays exponentially from its surface value
In a weak applied field, how does a superconductor expel nearly all magnetic flux?
By setting up electric currents near its surface
What is the manifestation of the phase transition from conductor to superconductor with respect to magnetic field exclusion?
Superdiamagnetism
Which class of superconductors exhibits an intermediate state consisting of a baroque pattern of regions of normal material mixed with regions of superconducting material?
Type-I
What term is used to describe the motion of flux vortices induced by the Lorentz forces from the current in some type-II superconductors?
Dissipation
What property does a weak applied field induce near the surface of a superconductor with regard to magnetic flux expulsion?
Surface currents shield the internal bulk from external applied field
What is minimized in a superconductor according to the London equation?
Electromagnetic free energy
Test your knowledge about the Meissner effect, the expulsion of a magnetic field from a superconductor when it transitions to the superconducting state. Learn about the discovery and implications of this phenomenon.
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