Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 28, Problem 76PQ
To determine
The expression for the current density as a function of
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A material of resistivity ρ is formed into the shape of a truncated cone of height it as shown in Figure P27.85. The bottom end has radius b, and the lop end has radius a Assume the current is distributed uniformly over any circular cross section of the cone so that the current density does not depend on radial position. (The current density docs vary with position along the axis of the cone.) Show that the resistance between the two ends is
The figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I = 5.70 A. The radius of cross-section A1 is r1 = 0.290 cm. (a) What is the magnitude of the current density across A1? a/m^2, Assume A2 = 2A1., (d) Specify the radius at A2.mm, (e) Specify the current at A2. A, (f) Specify the current density at A2. a/m^2
A copper wire has a diameter of 2.0 mm and a length of 3.0 m. It carries acurrent of 6.3 A. The density of free electrons in copper is 8.5×1028electrons per cubic meter and resistivity of copper is 1.7×10-8Ω.m.a) What is the current density in the wire?b) What is the resistance of the wire?c) What is the electric field in the wire?d) What is the drift velocity of free electrons? Or calculatethe drift velocity of free electrons (or find the drift velocity of freeelectrons)e) Find the power dissipated as heat in the wire
Chapter 28 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 28.1 - Prob. 28.1CECh. 28.2 - Prob. 28.2CECh. 28.3 - Prob. 28.3CECh. 28.5 - When a lightbulb burns out, its filament breaks so...Ch. 28.6 - A battery with terminal potential is connected to...Ch. 28.7 - A battery of terminal potential is connected to a...Ch. 28 - Prob. 1PQCh. 28 - Prob. 2PQCh. 28 - Prob. 3PQCh. 28 - Prob. 4PQ
Ch. 28 - Prob. 5PQCh. 28 - Prob. 6PQCh. 28 - Prob. 7PQCh. 28 - Prob. 8PQCh. 28 - Prob. 9PQCh. 28 - Prob. 10PQCh. 28 - Prob. 11PQCh. 28 - Prob. 12PQCh. 28 - Prob. 13PQCh. 28 - Prob. 14PQCh. 28 - The current in a wire varies with time (measured...Ch. 28 - Prob. 16PQCh. 28 - The amount of charge that flows through a copper...Ch. 28 - Prob. 18PQCh. 28 - Prob. 19PQCh. 28 - Prob. 20PQCh. 28 - Prob. 21PQCh. 28 - Prob. 22PQCh. 28 - A copper wire that is 2.00 mm in radius with...Ch. 28 - Prob. 24PQCh. 28 - Prob. 25PQCh. 28 - Prob. 26PQCh. 28 - What is the electric field in an aluminum wire if...Ch. 28 - Prob. 28PQCh. 28 - Prob. 29PQCh. 28 - Prob. 30PQCh. 28 - Prob. 31PQCh. 28 - Prob. 32PQCh. 28 - Two concentric, metal spherical shells of radii a...Ch. 28 - Prob. 34PQCh. 28 - Prob. 35PQCh. 28 - Prob. 36PQCh. 28 - Prob. 37PQCh. 28 - A lightbulb is connected to a variable power...Ch. 28 - Prob. 39PQCh. 28 - Prob. 40PQCh. 28 - Prob. 41PQCh. 28 - Prob. 42PQCh. 28 - Prob. 43PQCh. 28 - A Two wires with different resistivities, 1 and 2,...Ch. 28 - A copper and a gold wire are supposed to have the...Ch. 28 - Gold bricks are formed with the dimensions 7358134...Ch. 28 - Prob. 47PQCh. 28 - Prob. 48PQCh. 28 - Prob. 49PQCh. 28 - Prob. 50PQCh. 28 - Prob. 51PQCh. 28 - Prob. 52PQCh. 28 - Prob. 53PQCh. 28 - Prob. 54PQCh. 28 - A two-slice bread toaster consumes 850.0 W of...Ch. 28 - Prob. 56PQCh. 28 - Prob. 57PQCh. 28 - Prob. 58PQCh. 28 - Prob. 59PQCh. 28 - Prob. 60PQCh. 28 - Prob. 61PQCh. 28 - Prob. 62PQCh. 28 - Prob. 63PQCh. 28 - Prob. 64PQCh. 28 - Prob. 65PQCh. 28 - Prob. 66PQCh. 28 - Prob. 67PQCh. 28 - Prob. 68PQCh. 28 - Prob. 69PQCh. 28 - Prob. 70PQCh. 28 - Prob. 71PQCh. 28 - Prob. 72PQCh. 28 - Prob. 73PQCh. 28 - Prob. 74PQCh. 28 - Review When a metal rod is heated, its resistance...Ch. 28 - Prob. 76PQCh. 28 - Prob. 77PQCh. 28 - Prob. 78PQCh. 28 - Prob. 79PQCh. 28 - Prob. 80PQCh. 28 - Prob. 81PQCh. 28 - A conducting material with resistivity is shaped...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Figure P26.6 represents a section of a conductor of nonuniform diameter carrying a current of I=5.00 A. The radius of cross-section A1 is r1= 0.400 cm. (a) What is the magnitude of the current density across A1? The radius r2 at A2 is larger than the radius r1 at A1.(b) Is the current at A2 larger, smaller, or the same ? (c) Is the current density at A2 larger, smaller, or the same ? Assume A2 = 4A1. Specify the (d) radius, (e) current, and (f) current density at A2.arrow_forwardA linear accelerator produces a pulsed beam of electrons.The pulse current is 0.50 A, and the pulse duration is 0.10 ms. (a) How many electrons are accelerated per pulse? (b) What is the average current for a machine operating at 500 pulses/s? If the electrons are accelerated to an energy of 50 MeV, what are the (c) average power and (d) peak power of the accelerator?arrow_forwardA 5.00A Current runs through a 12-guage copper wire (diameter 2.05mm) and through a light bulb. Copper has 8.5 x 10^28 free electrons per cubic meter. (a) How many electrons pass through the light bulb each second? (b) What is the current density of the wire? (c) At what speed does a typical electron pass by any given point in the wire? (d) If you were to use wire of twice the diameter which of the above answer would change? Would they increase or decrease? Tip. Area for circle and velocity from J formula.arrow_forward
- Kiting during a storm. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend — he was neither stupid nor suicidal. Suppose a kite string of radius 2.10 mm extends directly upward by 0.802 km and is coated with a 0.520 mm layer of water having resistivity 155 Ω·m. If the potential difference between the two ends of the string is 176 MV, what is the current through the water layer? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500 000 A (way beyond just being lethal).arrow_forwardA rectangular block of copper has sides of length 17 cm, 23 cm, and 41 cm. If the block is connected to a 7.7 V source across two of its opposite faces, find the following. (a) What is the maximum current the block can carry?(b) What is the minimum current the block can carry?arrow_forwardThe figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I = 5.30 A. The radius of cross-section A1 is r1 = 0.510 cm. What is the magnitude (A/m2) of the current density across A1? Since the radius r2 at A2 is larger than the radius r1 at A1. will the current and current density at A2 larger, smaller, or the same? Assume A2 = 5A1. What is the radius, the current, and the current density at A2?arrow_forward
- Taking R = 1.00 k and = 250 V in Figure P27.19, determine the direction and magnitude of the current in the horizontal wire between a and e. Figure P27.19arrow_forwardThe figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I = 5.70 A. The radius of cross-section A1 is r1 = 0.290 cm. (a) What is the magnitude of the current density across A1? a/m^2, Assume A2 = 2A1., The radius r2 at A2 is larger than the radius r1 at A1. (b) Is the current at A2 larger, smaller, or the same? (c) Is the current density at A2 larger, smaller, or the same? (d) Specify the radius at A2.mm, (e) Specify the current at A2. A, (f) Specify the current density at A2. a/m^2arrow_forwardThe figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I = 5.60 A. The radius of cross-section A1 is r1 = 0.330 cm. (a) What is the magnitude of the current density across A1? A/m2 The radius r2 at A2 is larger than the radius r1 at A1. (b) Is the current at A2 larger, smaller, or the same? The current is larger.The current is smaller. The current is the same. (c) Is the current density at A2 larger, smaller, or the same? The current density is larger.The current density is smaller. The current density is the same. Assume A2 = 2A1. (d) Specify the radius at A2. mm(e) Specify the current at A2. A(f) Specify the current density at A2. A/m2arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Circuits, Voltage, Resistance, Current - Physics 101 / AP Physics Review with Dianna Cowern; Author: Physics Girl;https://www.youtube.com/watch?v=q8X2gcPVwO0;License: Standard YouTube License, CC-BY