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
is transition temperature?
The temperature at which a normal material
changes into a superconductor is called transition temperature (or) critical
any four property charges that occur in super conductor (or) what are the
properties of a superconductor.
(i) They have zero
(ii) They exhibit
(iii) The super
conducting property can be destroyed due to the application of magnetic and
transition temperature varies due to the presence of isotopes.
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.
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
In a superconducting material, transition
temperature varies with the average isotopic mass M of its constituents.
Tc α[1 / Mα]
Where αis called isotope
7. What are the applications of
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
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.
ACTIVITY1 Watch the video and a answer the questions below: 1