Pure copper has a resistivity of 1.68 x 10-8 Qm. Some accurate cubes of copper are prepared, and electrical measurements are made, for which current is passed across a pair of opposite faces. a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Ex- plain your answer. b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resis- tance between opposite faces of the stack? Calculate the resistance of each stack.

Pure copper has a resistivity of 1.68 x 10-8 Qm. Some accurate cubes of copper are prepared, and electrical measurements are made, for which current is passed across a pair of opposite faces. a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Ex- plain your answer. b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resis- tance between opposite faces of the stack? Calculate the resistance of each stack.

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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Pure copper has a resistivity of 1.68 × 10−8 Ωm. Some accurate cubes of copper are prepared,and electrical measurements are made, for which current is passed across a pair of oppositefaces.a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Explain your answer.b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resistance between opposite faces of the stack? Calculate the resistance of each stack.
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Problem 4 Copper has a work function of 4.70 eV, a resistivity of 1.7 x108 N:m, and a temperature coefficient of 3.9 x103 oC 1. Suppose you have a cylindrical wire of length 2.0m and diameter 0.50 cm connected to a variable power source; and a separate thin, square plate of copper. www (a) Draw a clear physics diagram showing each part of the problem. (b) At what temperature would the wire have 3.5 times the resistance that it has at 20 degrees? (c) Use Wien's Law (Eq 14-24) to find the peak wavelength of radiation emitted by a wire of this temperature. (d) If light at only the wavelength found above were shone onto the copper plate, what would be the maximum kinetic energy of the ejected photoelectrons?
The Resistance of Nichrome Wire The radius of a piece of Nichrome wire is 0.306 mm. (Assume the wire's temperature is 20°C.) (a) Calculate the résistance per unit length of this wire. SOLUTION Conceptualize This table shows that Nichrome has a resistivity two orders of magnitude larger than the best conductors in the table. Therefore, we expect it to have some special practical applications that the best conductors may not have. Categorize We model the wire as a ---Select--- so that a simple geometric analysis can be applied to find the resistance. Analyze Use this equation and the resistivity of Nichrome to find the resistance per unit length (in 0/m): R 0/m %3D %3D %3D A (b) If a potential difference of 10 V is maintained across a 1.0 m length of the Nichrome wire, what is the current in the wire? SOLUTION Analyze Use this equation to find the current (in A): AV I = %3D A R Finalize Because of its high resistivity and resistance to oxidation, Nichrome is often used for heating…
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Problem 3: A 1.2 g wire has a density of 2.7 g/cm3 and a resistivity of 2.7 × 10−8 Ωm. The wire has a resistance of 15 Ω. a) How long is the wire? b) The wire is made up of atoms with valence 1 and molar mass 26.98 g/mol. What is the drift speed of the electrons when there is a voltage drop of 30 V across the wire?
Question 2/ Vraag 2: Current and Resistance 2.1 A piece of wire I cm long carries a current I when a voltage V is applied across its ends at a temperature of 0°C. If the resistivity of the material of which the wird is made varies as shown in the figure, what length of the same diameter wire is needed so that the same current flows when the same voltage is applied at temperature 400°C? (4) 12 10 8 200 400 600 800 1000 Temperature ("C) Resistivity (10 2m)
6) In recent class lectures, we discussed the temperature dependence of the electrical resistivity, p(T) for the three main classes of materials that conduct an electrical current; conductors, semiconductors, and superconductors. In the graph below, draw in by hand examples of the temperature dependence of the electrical resistivity, pT), for each material type. Give at least one example of each material type. plT) + +>T(K) 100 200 300
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complete solution. A piece of copper wire has a resistance of 1.5Ω. Solve for the resistance of the manganin wire of one-fourth length and one-fifth diameter if the resistivity of manganin is 20 times that of copper.
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