In this lesson, we will learn how to calculate the properties required for a superconductor to operate, referring to its critical temperature and critical field.
Sample Question Videos
Worksheet: 5 Questions • 1 Video
At what temperature, in terms of the critical temperature , is the critical field of a superconductor one-half its value at ?
A Pb wire wound in a tight solenoid of diameter of 4.0 mm is cooled to a temperature of 5.0 K. The wire is connected in series with a 50-Ω resistor and a variable source of emf. As the emf is increased, what value does it have when the superconductivity of the wire is destroyed? The critical temperature of Pb is 7.2 K and the critical field value for Pb is 0.080 T.
Measurements of a superconductor’s critical magnetic field at various temperatures are shown in the accompanying table. Determine the value of the critical magnetic field at absolute zero. Assume a critical temperature value of 7.2 K.