Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
EFFECT OF FIELD ON SUPERCONDUCTIVITY: Critical Magnetic field, Hc is the maximum field that can be applied to a superconductor without destroying the superconducting behaviour. It decreases from its maximum value at absolute zero to zero at the critical temperature Tc. On the other hand, Critical Temperature Tc, is a temperature that separates superconducting states from the normal state. Above Tc the substance is the normal state whit a finite resistivity but below Tc it is in super conducting state whit zero resistivity. The transition temperature of a superconductor can be reduced by the application of a magnetic field. Whit reference to suppose a superconductor has a temperature Tc. If magnetic field H is applied, the material remains super conducting until a critical field Hc is reached such that for H >Hc, the material is in the normal state. The transition from the superconducting to the normal state under influence of a magnetic field is reversible. The function Hc (T) follows with good accuracy a formula from here ho is the critical field at 0K, Tc is the critical temperature for a given specimen.
MEISSNER EFFECT: The Meissner effect (or Meissner-Ochsenfeld Effect) is the total exclusion of any magnetic flux from the interior of a superconductor. A superconductor below its critical temperature expels all the magnetic field from the bulk of the sample as if it were a perfectly diamagnetic substance. This phenomenon is known as the Meissner effect. Suppose that we place a super conducting material in a magnetic field above Tc. The magnetic field lines will penetrate the sample. However, when the as depicted in fig. 6.3(a). The super conductor develops a magnetization M by developing surface currents, such that M and the applied field cancel everywhere inside the sample. Thus, below Tc a superconductor is a perfectly diamagnetic substance (χm= -1). Now for the case of a perfect conductor in a magnetic field and then cool it below. The magnetic field is not rejected. These two types of behaviour are identified. If we switch off the field, the field around the super conductor simply disappears. But switching off the field means there is a decreasing applied field. This change in the field induces current in the perfect conductor by virtue of Faraday’s law of induction.
what is astatistical ensemble?
How do I find the momentum, velocities and energy of both vehicles as they leave the impact point, the energy transferred during the collision and the momentum and energy of the ve
This spray head discharges water (density 62.4 lbm/ft ) at a rate of 4 ft /s. Assuming irrotational flow and an efflux speed of 65 ft/s in the free jet, determine what force acting
State the importance of emission and absorption spectra. Derive the mathematical expression for refractive index of material of the prism.
What is meant by tunnelling phenomenon? A tunnel diode is a high conductivity two-terminal P-N junction doped heavily about 1,000 times higher than a conventional junction diod
Q. Can you define Solar Constant? The luminosity of the Sun L is 3.827×10 26 Watts. When the Sun is straight overhead on a clear day how many watts would we expect to illumina
PN-Junction Diode: Introduction: An electronic device which is made by linking together P-type semi-conductor and N-type semiconductor is known as p-n junction diode or a
describe the construction and working of a Nicol prism.discuss how you obtain a plane polarised beam with it?
Falling bodies If you can search a building that is about 20 m high in your locality you can examine how gravity makes bodies fall faster the longer it acts on them. Get a piec
When a string under tension is set into vibration, transverse harmonic rays propagate along its length. When the size of string is same, reflected rays will also exist. The operati
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd