What is Wires: Definition and 543 Discussions

Wiley Interdisciplinary Reviews (abbreviated WIREs) is a set of peer-reviewed scientific journals that each publish interdisciplinary review articles on high-profile topics. The series was established in 2009 and is published by Wiley-Blackwell. Each journal publishes new review articles every month.
The journal series won the 2009 R.R. Hawkins Award from the Association of American Publishers.

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  1. K

    At Which Value of x is the Magnetic Field Zero?

    Homework Statement Consider two parallel conducting wires along the direction of the z axis as shown below. Wire 1 crosses the x-axis at x = -1.80 cm and carries a current of 2.60 A out of the xy-plane of the page. Wire 2 (right) crosses the x-axis at x = 1.80 cm and carries a current of 8.80...
  2. S

    Where is Magnetic Force Zero for Two Parallel Wires?

    In the picture, two parallel wires carry currents in opposite direction. Where will the magnetic force never be zero? http://img154.imageshack.us/img154/4706/31130394mv0.th.jpg 1. you need to know the currents to answer this question 2. nowhere 3. part A 4 part B 5 part C All I...
  3. Z

    Voltage difference and distance between wires

    Hi, Everyone, Just a quick question. In the diagram on this link, is V2 < V1 ? http://img246.imageshack.us/img246/4789/schemaep1.jpg Thanks.
  4. S

    Infinite wires with current, magnetic field vector

    Homework Statement three infinitely long straight wires are arranged in a plane as shown at the left. what is the magnetic field vector at point A(see attach.)? all wires carry current I Homework Equations F = IL X B where x indicates cross product, I is current, L is length, B is...
  5. S

    Parallel infinite wires - magnetic field

    Homework Statement four parallel infinite wires are arranged as shown in the figure: (see attachment) a) calculate the value of the magnetic field produced along the central axis of the configuration (magnitude and direction) b) a fifth wires is placed along a central axis, parallel to...
  6. P

    Two long wires: induced electric field

    Homework Statement Please see the attached figure. We have two parallel long wires carrying a time varying current I(t), but running in opposite directions. We wish to know the induced electric field between the wires, but only in the plane containing the two wires. Sorry that I don't know...
  7. D

    Calculating Magnetic Field from Parallel Wires

    Homework Statement Calculate the magnitude of the magnetic field at a point midway between two long, parallel wires that are 1.0 m apart and have currents of 10.0 A and 20.0 A, respectively, if the currents are: a) In opposite directions, and b) In the same direction. Homework...
  8. J

    Finding the force between 2 finite length wires

    [SOLVED] Finding the force between 2 finite length wires Homework Statement The two wires of length 2m are 3mm apart and carry a current of 10 A dc. calculate the force between these wires.Homework Equations Well, I know that the force is found with F=IL\times B Since we aren't given B, the...
  9. P

    Calculating Potential Difference Between Parallel Wires with Charge Densities

    Two wires (radius a) with charge densities +λ and -λ are placed parellel to on another a distance d away. Find an expression for the potential difference between the wires and simplify with the assumption the d>>a. From that I need to find the potential difference at the midpoint between the...
  10. S

    Linear Mass Density of current and wires

    [/B]Homework Statement The figure is a cross section through three long wires with linear mass density 43.0. They each carry equal currents in the directions shown. The lower two wires are 4.0 cm apart and are attached to a table. Homework Equations What current will allow the...
  11. clope023

    Ridid body equilibrium, tension in hanging wires

    [SOLVED] ridid body equilibrium, tension in hanging wires Homework Statement A 60.0cm, uniform, 49.0N shelf is supported horizontally by two vertical wires attached to the sloping ceiling. A very small 25.0N tool is placed on the shelf midway between the points where the wires are attached...
  12. D

    What current is needed for an equilateral triangle formation with three wires?

    Homework Statement The figure is a cross section through three long wires with linear mass density 52.0g/m. They each carry equal currents in the directions shown. The lower two wires are 4.0 cm apart and are attached to a table. (please see attachment) Just in case attachment is not working...
  13. M

    Ampere's Law and partial-circular wires.

    Why can't I use Ampere's law to compute the magnetic field at the center (P) of a semi-circular wire? If I calculate B at P due to d_theta, and then, using superposition, integrate from 0 to pi, the result is B=uI/2R. Biot-Savarte law gives the correct answer of B=uI/4R.
  14. T

    How Does Current Affect Magnetic Field at the Center of Two Wires?

    [SOLVED] Magnetic Field of Two Wires Homework Statement http://img80.imageshack.us/img80/5625/jonesj2qm4.gif If r = 30.0 mm, i = 2.00 A, and i' = 8.60 A, what is the magnitude of the magnetic field at the center point? Homework Equations B=(\mu_{0}I)/(2pi*r) The Attempt at a Solution I...
  15. C

    Magnetic Field and vectors from Two Wires

    Homework Statement In this problem, you will be asked to calculate the magnetic field due to a set of two wires with antiparallel currents as shown in the diagram . Each of the wires carries a current of magnitude . The current in wire 1 is directed out of the page and that in wire 2 is...
  16. M

    Solving Tension on Wires Homework

    Homework Statement A 75N bird feeder hangs from a vertical wire that is connected to two other upper wires that are attached to a horizontal support, as shown in the figure On a copy of the diagram, draw arrows to indicate the forces present in the wires By considering forces A...
  17. I

    Why Does a Wire Melt? | Current & Resistance Explained

    Hi all, I have been set an experiment of relating to the current needed to melt a wire (predominantly dealing with R = ρL/A). This sounds like a really dumb question (because it is :redface:) but why does the wire melt when too much current is passed through? Also, what is the correlation...
  18. L

    Frequency in two different wires

    I need help comprehending this one Homework Statement An aluminum wire. of length L1=60.0cm, cross-section area 1.00 x 10^-2 cm^2, and density 2.60g/cm^3, is joined to a steel wire, of density 7.80g/cm^3 and the same cross-section area. The compound wire, loaded with a block of mass...
  19. L

    Frequency in two different wires

    [SOLVED] Frequency in two different wires Homework Statement An aluminum wire. of length L1=60.0cm, cross-section area 1.00 x 10^-2 cm^2, and density 2.60g/cm^3, is joined to a steel wire, of density 7.80g/cm^3 and the same cross-section area. The compound wire, loaded with a block of mass...
  20. B

    How Much Current Flows in the Circular Loop When the Net Magnetic Field Is Zero?

    Homework Statement A very long, straight wire carries a current of 0.75 A. This wire is tangent to a single-turn, circular wire loop that also carries a current. The directions of the currents are such that the net magnetic field at the center of the loop is zero. Both wires are insulated...
  21. B

    Determining magnetic field around two parallel wires

    Two long, straight wires are separated by 0.12 m. The wires carry currents of 3.5 A in opposite directions, as the drawing indicates. (a) Find the magnitude of the net magnetic field at the point A. (b) Find the magnitude of the net magnetic field at the point B...
  22. X

    How Do Antiparallel Currents in Two Wires Affect the Magnetic Field at a Point?

    Homework Statement In this problem, you will be asked to calculate the magnetic field due to a set of two wires with antiparallel currents as shown in the diagram . Each of the wires carries a current of magnitude . The current in wire 1 is directed out of the page and that in wire 2 is...
  23. P

    Magnetic Forces on Current-Carrying Wires: Attraction & Repulsion

    Magnetic Forces on Current-Carrying Wires (Conceptual Question)...Is answer correct? Two straight wires are parallel to each other and carry different currents in the same direction. Do they attract or repel each other? How do the magnitudes of these forces on each wire compare...
  24. P

    Why is a Return Wire Necessary in Electrical Distribution?

    i m an electrical student. can anybody clearly tell me why is a return wire provided from the generating plant to the load? does current flow through the return wire or is it simply meant to form a closed lop?
  25. D

    Cutting a Copper Wire for Different Resistances

    I need help with one of my Physics homework problems please! A certain copper wire has a resistance of 10.0 Ohm. At what point along its length must the wire be cut so that the resistance of one piece is 4.0 times the resistance of the other? What is the resistance of each piece? I worked...
  26. U

    Force between two parallel wires

    Homework Statement Along horizontal wire carries a current at 48 A. A second wire,made of 2.5 mm diameter copper wire and parallel to the first,is kept in suspension magnetically 15 cm below.Determine the magnitude and direction of the current in the lower wire.Is the lower wire in stable...
  27. A

    Magnetic forces between parallel wires

    Homework Statement What is the force magnitude on the first, second, and third wires in the figure? Homework Equations (μ0L I1 I2)/(2πd) μ0 = 1.2566*10-6 The Attempt at a Solution Substituting 0.5 as L, 0.02 as d and 10 as I1 and I2 I get 5*10-4, which comes up as...
  28. Reshma

    Electric Field near current carrying wires

    Homework Statement Two parallel infinitely long wires separated by a distance D carry steady currents I1 and I2 (I1>I2) flowing in the same direction. A positive point charge is moves between the wires parallel to the currents with a speed v at the distance D/2 from either wire. What is...
  29. R

    Using multistrand wires for an ultrasonic transreceiver

    I was recently doing a project on a ultrasonic transreceiver, and was adviced to use thin multistrand wires for rigging the circuit., for reducing signal noise. I am not able to understand why we need to use multistrand wires, or if they help in reducing noise, how they help. Because i find...
  30. B

    Magnetic field at a point due to current carrying wires

    Homework Statement Homework Equations B =( \mu * i * \phi ) / (2 * \pi * R) The Attempt at a Solution i wanted to add one more equation, but I am having difficulty in writing them. whatever! As you can see from the question there are 6 segments of current carrying wires...
  31. T

    EM-Force between current wires

    [SOLVED] EM-Force between current wires Homework Statement Problem 105 in chapter 27 Tipler and Mosca for those playing at home... A long straight wire carries a current of 20 A, as shown in the figure. A rectangular coil with 2 sides parallel to the straight wire has sides 5 cm and 10...
  32. B

    Magnetic Field from Two Wires problem

    Hi, can someone help me out? I've tried 5 different solution that I thought were definitely right and they all give me the same response: "Your answer is off by a multiplicative factor." Homework Statement Find the magnitude of the net magnetic field B_L created at point L by both wires...
  33. S

    What are the steps to find tension in three wires?

    Ok here the problem i need to find the tension of the three wires but I am very lost and don't know where to start or how to finish. so for i got 32*98 = 313.6N i don't know what to do next can someone please lead me in the correct direction to solve the problem.
  34. W

    Calculating Magnetic Field Intensity Between Two Parallel Wires

    Homework Statement Two long parallel wires are a center-to-center distance of 1.50 cm apart and carry equal anti-parallel currents of 1.80 A. Find the magnetic field intensity at the point P which is equidistant from the wires. (R = 4.00 cm). Homework Equations B= \frac{u_{0}I}{2\pi r}...
  35. Z

    What keeps electrons on wires?

    say you have a current carrying wire pointing in the +x direction, while there's an external magnetic field pointing in +y. Then the electrons in the wire feel a force towards +z. Well, what stops them from flying off the wire? If you make the current or the magnetic field strength strong...
  36. G

    How much power is lost in heating the wires of a power line

    A generating station is producing 1.4e6 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.0e-2 \Omega/km. (a) Find the power lost in heating the wires if the power is...
  37. K

    Copper wires are more conductive than aluminium wires?

    Why do they say that copper wires are more conductor than aluminium wires?
  38. T

    Solving Problems Involving Ge, Well Lagged Wires, and Heat Flow

    Could anyone gives me some hints of how to solve these problems ? 1. a sample of Ge has both electrons and holes carrying the current. When a hall measurement is done, there's no hall effect. If the mobility of electrons in Germanium is 3500 cm^2/V.s and that of holes is 1500 cm^2/V.s, show...
  39. F

    Electric field between two wires and gauss law

    I'm not entirely sure how to word this without a diagram, but please bare with me! In an ideal case, the charge on a wire is evenly distributed. According to Gauss' Law, an electric field from a charged wire decays with 1/r where r is the distance from the centre of the wire. Say two...
  40. W

    Electric Stress between wires of a solenoid

    hi, guys: I am reading some notes of Electromagnetism. It claims that for a helix solenoid with N turns of wire, the distance between the successive coil is \Delta a, the total vertical length of the solenoid is d. The artical claims that if we apply a voltage v to this solenoid...
  41. S

    Magnetic Force of Wires: Solve Homework Equation

    Homework Statement A packed bundle of 100 long, straight, insulated wires forms a cylinder of radius R=.5cm a. if each wire carries 2A, what are the magnitude and direction of the magnetic force per unit length acting on a wire located .2cm from the center of the bundle? Homework...
  42. C

    Magnetic field between two long straight wires

    Hi. Any help on this problem would be greatly appreciated. Here is the problem: A)Determine the magnetic field between two long straight wires at a point 0.500cm from the left wire when the two wires are 3.00cm apart in terms of the current I1 (left wire) when the other (right wire) carries...
  43. O

    Understanding Right Hand Rules - Namely w/ parallel wires

    Homework Statement There seem to be three right hand rules for dealing with magnetic field, current, and force, and I don't quite understand how to use them. Namely, I'm having trouble understanding why two parallel wires with current flowing in each of them attract if the currents are in...
  44. B

    How Do Electrons Flow Through Conductive Wires?

    Is is known exactly how electrons flow through wires? For example a wire is conductive, the air around it is not, and thin wires conduct worse then thick wires, would this mean that the electrons force, or flow is greatest in the centre of the wire? Like water through a pipe?
  45. E

    Pipelining Wires: Explained for Microprocessor Architecture

    here's a statement "pipelining wires is an effective mechanism to overcome intrinsic wire latency" as related to the microprocessor architecture. What exactly is this "pipelining of wires"? I know what a pipeline architecture is of a processor vs let's say multicycle, but pipelining WIRES...
  46. A

    Two beads moving down fixed wires, connected by a spring

    I was going to post this in the homework section, but there wasn't any forum for graduate-level problems. If someone wants to move this thread to a more appropriate forum (assuming there is one), however, please feel free to do so. Anyway, this is a problem for my PhD qualifying exam that...
  47. K

    Find the tension in the two wires

    Homework Statement Find the tension in the two wires supporting the 36 kg traffic light shown in Fig. 12-57. (Assume that 1 = 52° and 2 = 38°.) http://img15.imgspot.com/u/07/77/15/952alt.gif Homework Equations -T1cos(52)+T2cos(38)=m*g T1sin(52)+T2sin(38)=0 The Attempt at a...
  48. S

    Magnetic Field between two wires

    Homework Statement Two parallel conductors carry currents in opposite directions, as shown in Figure P19.56. One conductor carries a current of 10.0 A. Point A is the midpoint between the wires, and point C is 5.00 cm to the right of the 10.0 A current. I is adjusted so that the magnetic...
  49. U

    Tension of two wires at 40 and 45 degrees

    Homework Statement An advertising sign of mass 40kg is suspended by two wires as shown in the diagram. What is the tension in each wire? http://img132.imageshack.us/img132/9681/untitledwx0.png I have no idea how to solve this, or what formulas a re relavent to it. Any suggestions are...
  50. L

    Distance separating current carrying wires.

    Homework Statement How far from a wire with a current of 5.0A is a second parallel wire with current 10A if force between them is 3.6x10^{-4} N? Homework Equations i think \frac{F}{L}=\left(\frac{u_o}{2\pi}\right)\left(\frac{I_{1}I_{2}}{s}\right) The Attempt at a Solution i think this just...
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