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 21PQ
To determine
The current and current density in region 2.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The 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?
A 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?
The density and resistivity of a cubic metal of mass m=81 g are d=3 g/cm3 and
ρ=1.5 x 10-8 Ω m, respectively. When a potential difference of ∆V=5x10-5 V is applied on two opposite faces of the cube, what is the current (A) passing through the surfaces ?
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
- 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^2arrow_forwardA long coaxial cable, crossection of which is shown in the figure, is made up of a cylindrical inner wire of radius a and a cylindrical shell shaped coaxial outer wire of inner radius b and outer radius c. The current density with magnitude J = Kr2/a is spread over the cross section of the inner wire where the current has out-of-page direction. Outer wire carries uniformly distributed current i = πKa 3 having into-the-page direction. a) Find the total current of the inner wire iin in terms of ?.Find expressions for the magnitude of magnetic field, b) inside the inner wire (r < a) c) between the wires (a< r< b) d) inside the outer wire (b< r < c) e) outside the outer wire (r> c) in terms of i, π, μ and r. For each case indicate the direction of the magnetic field as well.arrow_forwardGiven that the density of aluminum is 2.7x10³ kg/m³ , find the drift speed of the conduction electrons in an aluminum wire that has a cross-sectional area 10‐⁶ m² and carries a current of 10 A. Assume that each aluminum atom contributes one free conduction electron to the current.arrow_forward
- When a current flows in an aluminum wire of diameter 2.33 mm, the drift speed of the conduction electrons is 0.000279 m/s. The conduction electron density in aluminum is 6.00 x 10^28 m^-3. What is the electron current?arrow_forwardA 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 isarrow_forwardWhat is the electron drift speed in the 2.0-mm-diameter segment of the wire?arrow_forward
- A copper wire has a circular cross section with a radius of 1.06 mm. (a) If the wire carries a current of 3.38 A, find the drift speed (in m/s) of electrons in the wire. (Take the density of mobile charge carriers in copper to be n = 1.10 ✕ 1029 electrons/m3.) ???m/s (b) For the same wire size and current, find the drift speed (in m/s) of electrons if the wire is made of aluminum with n = 2.11 ✕ 1029 electrons/m3. ???m/sarrow_forwardThe figure gives the electric potential V(x) along a copper wire carrying uniform current, from a point of higher potential Vs = 14.0 μV at x = 0 to a point of zero potential at xs = 3.00 m. The wire has a radius of 2.10 mm, and copper has a resistivity of 1.69 × 10-8 Ω·m. What is the current in the wire?arrow_forwardConsider a resistor of resistivity 4.12 × 10-8 Ω • m. If an electric field of 19 V/m is applied across the resistor and the electron volume concetration in the conductor is 5.82 × 1028 per m3, determine the drift velocity, in mm/s, of the free electron constituting the current.arrow_forward
- A 2.0 x 102 - km - long high - voltage transmission line 2.0 cmin diameter carries a steady current of 1.0 x 103 A. If theconductor is copper with a free charge density of 8.5 x 1028electrons/m3, how many years does it take one electron totravel the full length of the cable?arrow_forwardWire section(1) of cross sectional area A1=3mm2 and wire section(2) of cross sectional area A2=7mm2 are connected by a tapered section as shown in the figure. The number density of conduction electrons in the wire is 1030 m-3 ,and resistivity of the wire p=2*10-6 ohm.m . Assume that the current is uniformaly distributed across any cross-section area through the wire's width. Magnitude of electric field in wire section (2) is 6 V/m. A) What is the current flowing in the wire? B) What is the drift speed of conduction electrons in wire section (1)?arrow_forwardA negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 × 10-7 m2 , and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
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: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
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