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Author Question: The BCS theory of superconductivity details the working of a superconductor. Choose the statement ... (Read 16 times)

Mr3Hunna

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on: Jul 28, 2018
The BCS theory of superconductivity details the working of a superconductor. Choose the statement below that describes one of its characteristics.
 
 

a. Single electrons are responsible for establishing currents in the superconductor.
  b. Currents flow without resistance until the lattice begins to vibrate.
  c. The repulsion of electrons in pairs is significantly reduced by the extremely low temperatures of superconductor operation, making electron pairing possible.
  d. A pair of electrons becomes like a boson and transitions to a ground state with other electron pairs.


  e. The resistance decreases in proportion to the lattice vibrations, which in turn decrease with decreasing temperature.
 

Question 2

The Meissner effect in a superconductor
 
a. is lost higher than the Curie temperature.
  b. generates currents to counteract magnetic flux.
  c. makes the superconductor a perfect paramagnet below the critical field level.
  d. is independent of the zero resistivity property of a superconductor.
  e. can remain even after the temperature goes above the transition temperature.


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ashely1112

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Reply #1 on: Jul 28, 2018
Answer to Question 1

d.
The two fermionic electrons pair to form a boson, which does transition to the superconducting state. This state is similar to superfluid helium, the Bose-Einstein condensate.

Answer to Question 2

Because the electrical resistivity of a superconductor is zero, arbitrarily large currents generate within the superconductor to oppose any magnetic flux (up to a certain critical field) within the material. This is known as the Meissner effect.
b.


Mr3Hunna

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Reply 2 on: Jul 28, 2018
Gracias!

helenmarkerine

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Reply 3 on: Yesterday
Excellent

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