Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term

9th Edition

ISBN: 9781305932302

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the di…

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Chapter 43, Problem 52P

A direct and relatively simple demonstration of zero DC resistance can be carried out using the four-point probe method. The probe shown in Figure P43.52 consists of a disk of YBa₂Cu₃O₇ (a high-T_c superconductor) to which four wires are attached. Current is maintained through the sample by applying a DC voltage between points a and b, and it is measured with a DC ammeter. The current can be varied with the variable resistance R. The potential difference ΔV_cd between c and d is measured with a digital voltmeter. When the probe is immersed in liquid nitrogen, the sample quickly cools to 77 K, below the critical temperature of the material, 92 K. The current remains approximately constant, but ΔV_cd drops abruptly to zero, (a) Explain this observation on the basis of what you know about superconductors. (b) The data in the accompanying table represent actual values of ΔV_cd for different values of I taken on the sample at room temperature in the senior author’s laboratory. A 6-V battery in series with a variable resistor R supplied the current. The values of R ranged from 10 Ω to 100 Ω. Make an I-ΔV plot of the data and determine whether the sample behaves in a linear manner, (c) From the data, obtain a value for the DC resistance of the sample at room temperature. (d) At room temperature, it was found that ΔV_cd = 2.234 mV for I = 100.3 mA, but after the sample was cooled to 77 K, ΔV_cd = 0 and I = 98.1 mA. What do you think might have caused the slight decrease in current?

Chapter 43, Problem 52P, A direct and relatively simple demonstration of zero DC resistance can be carried out using the , example 1

Figure P43.52

Current Versus Potential Difference ΔV_cd Measured in a Bulk Ceramic Sample of YBa₂Cu₃O_7−δ at Room Temperature

Chapter 43, Problem 52P, A direct and relatively simple demonstration of zero DC resistance can be carried out using the , example 2

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Chapter 43, Problem 51P

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Chapter 43 Solutions

Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term

Ch. 43.1 - For each of the following atoms or molecules,...Ch. 43.2 - Prob. 43.2QQ Ch. 43.2 - Prob. 43.3QQ Ch. 43 - Prob. 1OQ Ch. 43 - Prob. 2OQ Ch. 43 - Prob. 3OQ Ch. 43 - Prob. 4OQ Ch. 43 - Prob. 5OQ Ch. 43 - Prob. 6OQ Ch. 43 - Prob. 7OQ

Ch. 43 - Prob. 1CQ Ch. 43 - Prob. 2CQ Ch. 43 - Prob. 3CQ Ch. 43 - Prob. 4CQ Ch. 43 - Prob. 5CQ Ch. 43 - Prob. 6CQ Ch. 43 - Prob. 7CQ Ch. 43 - Prob. 8CQ Ch. 43 - Discuss models for the different types of bonds...Ch. 43 - Prob. 10CQ Ch. 43 - Prob. 1P Ch. 43 - Prob. 2P Ch. 43 - Prob. 3P Ch. 43 - Prob. 4P Ch. 43 - Prob. 5P Ch. 43 - Prob. 6P Ch. 43 - Prob. 7P Ch. 43 - Prob. 8P Ch. 43 - Prob. 9P Ch. 43 - Prob. 10P Ch. 43 - Prob. 12P Ch. 43 - Prob. 13P Ch. 43 - Prob. 14P Ch. 43 - Prob. 15P Ch. 43 - Prob. 16P Ch. 43 - The nuclei of the O2 molecule are separated by a...Ch. 43 - Prob. 18P Ch. 43 - Prob. 19P Ch. 43 - Prob. 20P Ch. 43 - Prob. 21P Ch. 43 - Prob. 22P Ch. 43 - Prob. 23P Ch. 43 - Prob. 24P Ch. 43 - Prob. 25P Ch. 43 - Prob. 27P Ch. 43 - Prob. 28P Ch. 43 - Prob. 29P Ch. 43 - Prob. 30P Ch. 43 - Prob. 31P Ch. 43 - Prob. 32P Ch. 43 - Prob. 33P Ch. 43 - Prob. 34P Ch. 43 - Prob. 35P Ch. 43 - Prob. 36P Ch. 43 - Prob. 37P Ch. 43 - Prob. 38P Ch. 43 - Prob. 39P Ch. 43 - Prob. 40P Ch. 43 - Prob. 41P Ch. 43 - Prob. 42P Ch. 43 - Prob. 43P Ch. 43 - Prob. 44P Ch. 43 - Prob. 45P Ch. 43 - Prob. 46P Ch. 43 - Prob. 47P Ch. 43 - Prob. 49P Ch. 43 - Prob. 50P Ch. 43 - Prob. 51P Ch. 43 - A direct and relatively simple demonstration of...Ch. 43 - Prob. 53P Ch. 43 - Prob. 54AP Ch. 43 - Prob. 55AP Ch. 43 - Prob. 56AP Ch. 43 - Prob. 57AP Ch. 43 - Prob. 58AP Ch. 43 - Prob. 59AP Ch. 43 - Prob. 61AP Ch. 43 - Prob. 62AP Ch. 43 - Prob. 63CP Ch. 43 - As an alternative to Equation 43.1, another useful...

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Solution Summary: The author explains the observation of zero voltage drop across cd on the basis of superconductors.

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