The level of liquid helium (temperature = 4 K) in its storage tank can be monitored using a vertically aligned niobium- titanium (NbTi) wire, whose length l spans the height of the tank. In this level-sensing setup, an electronic circuit Constant I maintains a constant electrical current I at all times in the Helium NbTi wire and a voltmeter monitors the voltage differ- ence V across this wire. Since the superconducting critical temperature for NbTi is 10 K, the portion of the wire immersed in the liquid helium is in the superconducting state, while the portion above the liquid (in helium vapor with temperature above 10 K) is in the normal state. Define f = x/l to be the fraction of the tank filled with liquid helium (Fig. 18–38) and Vo to be the value of V when the tank is empty (f = 0). Determine the relation between fand V (in terms of Vo). vapor (>10K) Liquid helium (=4K) FIGURE 18–38 Problem 91. Superconducting Normal

The level of liquid helium (temperature = 4 K) in its storage tank can be monitored using a vertically aligned niobium- titanium (NbTi) wire, whose length l spans the height of the tank. In this level-sensing setup, an electronic circuit Constant I maintains a constant electrical current I at all times in the Helium NbTi wire and a voltmeter monitors the voltage differ- ence V across this wire. Since the superconducting critical temperature for NbTi is 10 K, the portion of the wire immersed in the liquid helium is in the superconducting state, while the portion above the liquid (in helium vapor with temperature above 10 K) is in the normal state. Define f = x/l to be the fraction of the tank filled with liquid helium (Fig. 18–38) and Vo to be the value of V when the tank is empty (f = 0). Determine the relation between fand V (in terms of Vo). vapor (>10K) Liquid helium (=4K) FIGURE 18–38 Problem 91. Superconducting Normal

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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