PHY_10_51_V1_DM_Superconduct
Оценка 4.9

PHY_10_51_V1_DM_Superconduct

Оценка 4.9
docx
07.05.2020
PHY_10_51_V1_DM_Superconduct
PHY_10_51_V1_DM_Superconduct.docx

ACTIVITY1 Watch the video and a answer the questions below:

1 Group questions: https://www.youtube.com/watch?v=bthBMyXzjkQ

1.    Who discovered the phenomena superconductivity?

2.    How was discovered the phenomena superconductivity?

3.    Name the applications of superconductivity

 

2 Group questions: https://www.youtube.com/watch?v=HKE8GsVres8

 

1.    The main disadvantage of  copper wire conductor in transmitting energy?

2.    Structure of  superconductor energy transfer cable

 

3 Group questions: https://www.youtube.com/watch?v=GHtAwQXVsuk

 How does levitating train works?

 

 

ACTIVITY 2: Questions on topic Superconductivity

 

1.    Define of super conductivity and super conductors.

_____________________________________________________________________________

2.    What is transition temperature?

_____________________________________________________________________________________________________________________________________________________________________________________

 

3.    Mention any four property charges that occur in super conductor (or) what are the properties of a superconductor.

_____________________________________________________________________________________________________________________________________________________________________________________

4.    What is Meissner effect?

_____________________________________________________________________________________________________________________________________________________________________________________

5.    Explain the term critical magnetic field in superconductor.

_____________________________________________________________________________________________________________________________________________________________________________________

6.    What is isotope effect in superconductivity?

_____________________________________________________________________________________________________________________________________________________________________________________

 7. What are the applications of superconductors?

_____________________________________________________________________________________________________________________________________________________________________________________

8.    What is magnetic levitation?

_____________________________________________________________________________________________________________________________________________________________________________________

 

 ANSWERS to questions

 

1.        Define of super conductivity and super conductors.

The phenomenon of losing the resistivity absolutely to zero, when cooled to sufficiently low temperature ie., below critical temperature (Tc) is called superconductivity.

The materials which exhibit superconductivity phenomena are called superconductors or superconducting materials.

 

2.       What is transition temperature?

The temperature at which a normal material changes into a superconductor is called transition temperature (or) critical temperature (TC).

 

3.        Mention any four property charges that occur in super conductor (or) what are the properties of a superconductor.

 (i)    They have zero resistivity.

 (ii)    They exhibit perfect diamagnetism.

 (iii)    The super conducting property can be destroyed due to the application of magnetic and electric fields.

 (iv)    The transition temperature varies due to the presence of isotopes.

 

4.                  What is Meissner effect?

When a material is cooled below its transition temperature i.e., T ≤TC, the material becomes a perfect diamagnetic. The magnetic flux originally present in the material gets ejected out of a superconductor. This effect is known as Meissner effect.

 

5.      Explain the term critical magnetic field in superconductor.

At any temperature below the critical temperature, minimum magnetic field is required to destroy the superconducting property. This magnetic field is known as critical magnetic field (HC).

It is given by the relation, Hc = Ho [1- (T / Tc)2]

 HC → Critical magnetic field at any temperature HO → Critical magnetic field at absolute zero temperature TC →   Transitiontemperature of the material

 

6.What is isotope effect in superconductivity?

In a superconducting material, transition temperature varies with the average isotopic mass M of its constituents.

 Tc α[1 / Mα]

Where αis called isotope effect coefficient.

 

7. What are the applications of superconductors?

Superconductors are used for the production of high magnetic field magnets.

By using superconducting materials, it is possible to manufacture electrical generators and transformers in exceptionally small sizes having effiecncy of 99.90% Superconducting materials are used in the construction of very sensitive electrical measuring instruments such as galvanometers.

 Superconducting materials if used for power cables will enable transmission of power over very long distances without any significant power loss or drop in voltage.

 

8.What is magnetic levitation?

The magnetic levitation is based on diamagnetic property of a superconductor which is the rejection of magnetic flux lines. A superconductor can be suspended in air against the repulsive force from a permanent magnet. This magnetic levitation effect can be used for high speed transportation without frictional loss.


 

Скачано с www.znanio.ru

ACTIVITY1 Watch the video and a answer the questions below: 1

ACTIVITY1 Watch the video and a answer the questions below: 1

ANSWERS to questions 1.

ANSWERS to questions 1.
Скачать файл