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. S

    Magnetic Field from Two Wires help?

    Homework Statement http://session.masteringphysics.com/problemAsset/1004684/21/189576A.jpg Point M is located a distance 2d from the midpoint between the two wires. Find the magnitude of the magnetic field created at point M by wire 1.<---Already did; answer was B_1M =...
  2. F

    Magnetic field from two wires distance

    Homework Statement At one instant, the two conductors in a long household extension cord carry equal 1.61 A currents in opposite directions. Find the magnetic field 2.4 cm away from the middle of the straight cord, in the plane of the two wires, if the centers of the two wires are 2.92 mm apart...
  3. C

    Magnetic force of two parallel wires is inverse proportional to distance?

    according too: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html#c1F=(u * I *I2)/(2pi *r ) i thought it would be inverse proportional to the square of the distance?! can this be right?
  4. C

    Magnetic force between two parallel hanging wires

    Magnetic force between two parallel hanging wires (solved) Homework Statement Two long, parallel wires hang by 4.00-cm-long cords from a common axis. The wires have a mass per unit length of 1.30×10−2 kg/m and carry the same current in opposite directions. What is the current in each wire...
  5. jegues

    Magnetic Field, Parallel wires carrying current

    Homework Statement See figure attached. Homework Equations The Attempt at a Solution i = 5A, d=8cm, R=5cm. Okay so we will have a two 3,4,5 triangles back to back from the center of each wire to the point in question. Since the currents are in the same direction, the magnetic...
  6. M

    Method of allowing wires into a hermetically sealed unit

    Hi, Quick question, if anybody has any ideas that would be great. I am looking to allow a few small wires to pass into a hermetically sealed ECU enclosure on a small racecar. How can I allow wires in without compramising the fact its meant to be hermetically sealed (at least IP66)...
  7. I

    Magnetic field at origin because of 3 wires

    Homework Statement Determine the magnetic field (in terms of I, a, and d) at the origin due to the current loop shown in Figure P30.14. (Use mu_0 for µ0, pi for π, a, d, and I as necessary.) http://www.webassign.net/pse/pse6_p30-14.gif Homework Equations B=mu_0(I)/(2pi*r) for straight...
  8. H

    Two Infinitely long wires.

    Homework Statement Two infinitely long wires run parallel to the z-axis. Wire a is 5.0 cm along the y-direction from the z-axis and carries a current of 1.5 A out of the page. Wire b is 10.0 cm long along the x-direction from the z-axis carries a current of 0.5 A into the page. a)...
  9. F

    Forces on current carrying wires

    Homework Statement Two long parallel conductors separated by 10.0 cm carry currents in the same direction. The first wire carries a current I1 = 5.00 A, and the second carries I2 = 8.00 A. http://img52.imageshack.us/img52/7425/asasssf.th.png Uploaded with ImageShack.us (a) What is...
  10. F

    Two current carrying wires. Confusion

    Homework Statement Let there be two current carrying wires with current flowing in the same direction. According to my book, they attract by the right hand rule. Now here is my question, since the B-field is popping inwards for one of the wires and the other one is popping outwards in the...
  11. P

    Help Solving Physics Problem: 2 Wires, Block & Velocity

    Homework Statement http://img18.imageshack.us/img18/4880/questionf.png Uploaded with ImageShack.us Homework Equations if the 2 wires on both sides move with downward velocity u , with what velocity does the block rise , the angle with vertical is a ; The Attempt at a Solution...
  12. E

    Calculating Magnetic Force on a Moving Charge near an Infinite Straight Wire

    Homework Statement An infinite straight wire is located at origin of a coordinate system. It has a large current of 73 x 107 amps running positive z direction. A point charge of -4 micro-Coulombs is moving at 3 x 106 m/s in positive x direction at point x=1.9 m, y=4.5 m. What is magnitude of...
  13. V

    Magnetic fields from 3 current carrying wires

    Homework Statement Consider three straight infinitely long (parallel to each other), equally spaced wires (with distance d), each carrying a current I in the same direction. (a) Calculate the locations where magnetic field is zero. (b) Sketch the magnetic field line pattern. (c) If the...
  14. F

    Current Between Long Straight Conducting Wires

    Homework Statement Two identical long straight conducting wires with a mass per unit length of 25.0 g/m are resting parallel to each other on a table. The wires are separated by 2.5 mm and are carrying currents in opposite directions. a) If the coefficient of static friction between the...
  15. B

    DC Motor Wires: Current Flow With/Without Insulation

    http://img23.imageshack.us/img23/6131/17743493.jpg One thing bothers me... If we have a wire with NO insulation, and we make a loop like in these 2 examples. Connect those ends to battery. Current runs from + to -. Now, will the current behave like in A or in B(no insulation). I know...
  16. Femme_physics

    Advantages/disadvantages of twisted wires VS wires bundled next to each other

    I saw "Oresund Bridge - Megastructures" in national geographic, and that bridge is made out of wires bundled next to each other, rather than twisted wires. I wonder, since twisted wires are stronger, what is the advantage of wires bundled next to each other?
  17. R

    Minimum Tension for Suspended 100kg Sign - Tension and Wires

    Homework Statement A sign (m=100kg) is suspended by two wires as shown. Determine the minimum tension the wires mus be able to provide 110 DEGREES 100 kg Diagram: \ / \110 / \ / \ / \/ ________ | 100kg | ---------- Homework Equations The Attempt at...
  18. B

    Force between Wires: Is it Electromagnetic?

    just a quick question the force between two current carrying wire is a electromagnetic force correct?
  19. U

    Maximum Magnetic Field B/w 2 Parallel Wires

    Two infinitely long wires are in the negative x direction. The wires are separated by distance 2a. They are parallele to one another. They lie along the x-axis with x = o being in the middle.Both wires are at z = 0. (a) Sketch the magnetic field pattern in the yz plane. (b) At what distance d...
  20. jegues

    Magnetic Force due to current Parallel Wires

    Homework Statement See figure attached Homework Equations The Attempt at a Solution I've attempted to draw the magnetic fields resulting at the location of wire 4 due to wires 1, 2, 3. I denoted them as B4,1, as in the "The magnetic field at 4 as a result of 1". Are these...
  21. S

    Neutral Wires: What They Are & Their Colors

    what are neutral wires and their colours?
  22. S

    True False-two long current carrying wires?

    Homework Statement Consider two long current-carrying wires (A and B) that are parallel to each other. Which of the following statements are true about the force between these two wires? if the current in wire A increases, then the force on wire A will stay the same, but the force on wire B...
  23. H

    C12B 2011 Problem 23Finding Zero Net Magnetic Field Points in Crossed Wires

    Homework Statement Two very long fixed wires cross each other at right angles. They do not touch but are close to each other. Equal currents flow in each wire in the directions shown below. Indicated the locus of points where the net magnetic field is zero. (I2) ^ |...
  24. T

    Calculating Electric Field Near Two Wires Using Vector Notation

    I'm not asking for the solutions, I just need to know what methods to use.Homework Statement The Attempt at a Solution I got this equation using this method but I don't know how to apply it to the questions. I think I need to be using unit vector notation as well? Also, it asks for the...
  25. F

    Capacitance between two crossed wires

    Homework Statement I have two wires (length L) which are separated by a distance d. They are also oriented perpendicularly (but I am curious about the orientation impact, part of the question). By simplification, I assume them to be cylinders of radius R (in actuality they are likely...
  26. B

    Why do two wires with currents in the same direction attract?

    I understand that using F = qv x B and the fact that positive currents generate counter clockwise magnetic fields, it can be concluded that two parallel wires carrying currents in the same direction attract. But what about when you think about it in the frame of reference of the charges in...
  27. Q

    Dipole/quadrupole moments of wires in x-y plane

    Homework Statement Two identical, infinitely thin, homogeneously charged cylinders (length L) are placed in the xy plane and form an angle phi (so that they make a V shape). Calculate the angle phi, for which the dipole contribution to the electric field potential at (x0,0,0) is exactly...
  28. S

    Magnetic field at the center of a cube of wires

    Homework Statement Find the magnetic field at a point p in the center of the cube with side length 2b. Homework Equations Biot-Savart Law The Attempt at a Solution I attempted using the biot-savart law, but my answer contradicts what someone told us as a hint. Supposedly the...
  29. S

    Magnetic Field Between Two Wires

    Homework Statement Two long parallel wires 20 cm apart carry currents of 5.0 A and 8.0 A in the same direction. Is there any point between the two wires where the magnetic field is zero. Homework Equations B=muI1I2/(2pir) The Attempt at a Solution I set the two B equations equal to...
  30. T

    Magnetic repulsion between 2 wires?

    Homework Statement A wire with a weight per unit length of 0.040 N/m is suspended directly above a second wire. The top wire carries a current of 30.0 A and the bottom wire carries a current of 90.0 A. Find the distance of separation between the wires so that the top wire will be held in...
  31. S

    Magnetic Field & 2 wires with same current

    Homework Statement Two long, straight, parallel wires, 10.0 cm apart carry equal 3.78A currents in the same direction. Find the magnitude and direction of the magnetic field at point 15.4 cm above one wire. Homework Equations B= (\mu0I)/(2\pir) \mu0 = 4\pi * 10-7 Use the right hand...
  32. I

    Two current carrying wires perpendicular to each other

    two long wires carry current and are at right angles to each other, but they do not touch. describe the force between them I found the magnetic field and force direction individually when one wire's current points north and the other east. I just don't quite understand the affect they have on...
  33. S

    Connecting Wires: Questions on Soldering & Tapping into an Add-a-Circuit

    Hey guys, i have a few basic soldering and wire connecting questions and would like you guys' help since I am not familiar with wiring. Basically I have 2 wires that I want to tap into the "add-a-circuit" pictured below. What kind of connector is the one in blue? If I want to tap 2 wires into...
  34. F

    Direction of magentic field with two wires?

    direction of magentic field with two wires?? Homework Statement Two long, straight wires cross each other at right angles. Find the direction and magnitude of the magnetic field at point P, which is in the same plane as the two wires Homework Equations Bnet = B1 - B2 B= U0I/2pir...
  35. F

    Mag force between two wires with opposite charges

    Homework Statement Two wires shown in figure p19.48 carry currents of 5.00A in opposite directions and are separated by 10cm. Find direction and magnitude of the net mag field. (a) at a point midway between the wires. (b) at point P1 (c) at point P2 Homework Equations B=B1+B2?? B= u0I /...
  36. E

    Replacing Aluminium windings for Motors with copper wires

    Good Day, I have defective Aluminium windings motor. As you know Aluminium is very difficult to winding. So, I want to use Copper wire to re-winding the motor. How can I do that? What size should I use and what will be the number of turns? Someone told me that you can use...
  37. M

    Magnetic Fields and insulated wires

    Homework Statement Two insulated wires cross at a 30 degree angle but do not make electrical contact. Each wire carries a 5.0 A current to the left through their respective wires. There are two points. One point lies between the bottom 150 degree angle, and the other lies between the right...
  38. D

    Tension in wires tied together

    Homework Statement 2 cables are tied together at C as shown. Determine the tension in AC and BC. (ans: 120.1N, 156.3N) Homework Equations The Attempt at a Solution tan-1 4/5 = 38.66 tan-1 4/3 = 53.13 100/tan 38.66 = ACx ACx = 124.99 AC = sqrt(124.99^2 + 100^2) AC =...
  39. C

    Litz conductor surrounded by drain wires = huge capacitance?

    this type of cable is used to transfer power underground: http://www.mahanson.com/images/Hendrix%20Cable.jpg see the drain wires? i would think that those would be a huge problem because they are grounded and are right next to the conductor, i suppose any shielding would have this problem...
  40. D

    Multemeter - dc current warms wires.

    Just curious why the red & black leads from my multimeter get quite warm when measuring higher dc current under a 20A setting? First I measured 4-5amps for 20secs & the leads didn't get warm, then measured another system with 16-17amps draw & within 5 seconds it got quite warm. Not like its...
  41. F

    How do you find the B field between finite wires?

    I know the results for infinite, but how about finite? And where is the cutoff with the aproximation of infinite? I've heard the value 10% tossed around is that right?
  42. F

    Infinite array of charged wires

    In the Feynman Lectures, Volume II, Chapter 7, the final two pages (7-10 and 7-11), Feynman describes an infinite array of parallel charged wires and uses a Fourier series to solve for the field above them. He shows that the series can be expressed entirely in terms of cosine terms and that the...
  43. N

    Magnetic Fields of Long Straight Wires

    Homework Statement Two long straight wires are shown. Wire 1 has a current of 25A and lies 0.05 m away from point O. Wire 2 carries a current of 110 A and sits a distance of 0.25m away from point O as shown. (i) What is the direction and magnitude of the magnetic field at point O due...
  44. D

    Magnetic force b/w wires of unequal length

    Is there a formula for the force between two parallel wires of non-equal length? Would one just use the length of the shorter of the two wires?
  45. M

    Field strength between two wires

    I feel like a stupied girl. :( It think it's not very hard, but I have to have the correct answear before i send it to my school. Homework Statement We sometimes exposed to electric fields. To determine whether there is a risk of flashover is a rule of thumb which states that the sparks will...
  46. Q

    Magnetic field between two wires (vector sums)

    Homework Statement Two parallel wires carry a current I and 2I in different directions. What is the magnetic field halfway between the two wires? Homework Equations Ampere's law Int (B dot dA) = permissivity x enclosed current The Attempt at a Solution Draw a circle around wire 1...
  47. P

    Magnetic Field from Two Wires

    Homework Statement I upploaded a picture of the problem... The part I'm stuck on asks this: Point L is located a distance d sqrt2 from the midpoint between the two wires. Find the magnitude of the net magnetic field BL created at point L by both wires. I had already solved that...
  48. S

    Magnetic Field Due to Two Parallel Wires

    Homework Statement A long, straight wire carries a current of 1.7 A in the +z direction and lies along the line x = –3.0 cm, y = 0. A second such wire carries a current of 1.7 A in the +z direction and lies along the line x = +3.0 cm, y = 0, as shown in Figure. Find the magnetic field at a...
  49. K

    Ampere's Law and straight wires

    The figure below shows two long, straight wires in the xy plane and parallel to the x axis. One wire is at y = −6.0 cm and the other wire is at y = +6.0 cm. The current in each wire is 19 A. If the currents are both in the −x direction, find the magnetic field at the following points on the y...
  50. Z

    How Does Changing Length and Area Affect the Resistance of Copper Wires?

    Homework Statement a copper wire of length of length L and cross sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross sectional area of 1/2 A. what is the resistance of the second copper wire? Homework Equations R = pL/A L =...
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