Q.1. The metals Cu and Pb have diamagnetic susceptibilities -9.63x10-6 and -1.58x10-5, respectively. Furthermore, Pb is a superconductor with T-7.2 K and Bo=800 G. Compare the magnetic energies of Cu and Pb in an external field of 500 G at 7.5 K and 0.1 K; assume the long-wire geometry with the field parallel to the wire. What is the principal difference in the free energy of the Pb sample at the two temperatures and in the presence of the field?
Q.1. The metals Cu and Pb have diamagnetic susceptibilities -9.63x10-6 and -1.58x10-5, respectively. Furthermore, Pb is a superconductor with T-7.2 K and Bo=800 G. Compare the magnetic energies of Cu and Pb in an external field of 500 G at 7.5 K and 0.1 K; assume the long-wire geometry with the field parallel to the wire. What is the principal difference in the free energy of the Pb sample at the two temperatures and in the presence of the field?
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Transcribed Image Text:Q.1. The metals Cu and Pb have diamagnetic susceptibilities -9.63×10-6 and
-1.58x10-5, respectively. Furthermore, Pb is a superconductor with T=7.2 K and
Bo=800 G. Compare the magnetic energies of Cu and Pb in an external field of 500 G
at 7.5 K and 0.1 K; assume the long-wire geometry with the field parallel to the wire.
What is the principal difference in the free energy of the Pb sample at the two
temperatures and in the presence of the field?
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