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7) A cylindrical superconductor (type I with a penetration depth of 200 nm) of radius 0.2 m has an axial hole in the center of radius 0.1 m. The superconductor is field cooled with 3 Tesla (field is applied before cooling completed). a) What is the ratio of the flux stored in the hole to the superconducting region when it is cooled to 30 Kelvin, well below Tc = 90 Kelvin. b) What is the value of the current density on the outside and on the inside surfaces?

7) A cylindrical superconductor (type I with a penetration depth of 200 nm) of radius 0.2 m has an axial hole in the center of radius 0.1 m. The superconductor is field cooled with 3 Tesla (field is applied before cooling completed). a) What is the ratio of the flux stored in the hole to the superconducting region when it is cooled to 30 Kelvin, well below Tc = 90 Kelvin. b) What is the value of the current density on the outside and on the inside surfaces?

University Physics Volume 3
University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter9: Condensed Matter Physics
Section: Chapter Questions
Problem 79P: At what temperature, in terms of Tc, is the critical field of a superconductor one-half its value at...
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7) A cylindrical superconductor (type I with a penetration depth of 200 nm) of radius 0.2 m has an axial hole in the center of radius 0.1 m. The superconductor is field cooled with 3 Tesla (field is applied before cooling completed). a) What is the ratio of the flux stored in the hole to the superconducting region when it is cooled to 30 Kelvin, well below Tc = 90 Kelvin. b) What is the value of the current density on the outside and on the inside surfaces?
Transcribed Image Text:7) A cylindrical superconductor (type I with a penetration depth of 200 nm) of radius 0.2 m has an axial hole in the center of radius 0.1 m. The superconductor is field cooled with 3 Tesla (field is applied before cooling completed). a) What is the ratio of the flux stored in the hole to the superconducting region when it is cooled to 30 Kelvin, well below Tc = 90 Kelvin. b) What is the value of the current density on the outside and on the inside surfaces?
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