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 forces exerted by current-carrying wires

    Homework Statement The figure (http://img.photobucket.com/albums/v80/northerndancer/thefigure.jpg?t=1173558797 ) is a cross section through three long wires with linear mass density 50 g/m. They each carry equal currents in the directions shown. The lower two wires are 4.0 cm apart and are...
  2. T

    Solve Current in Parallel Wires with Repulsion

    Homework Statement Two long parallel wires, each with a mass per unit length of 43 g/m, are supported in a horizontal plane by 6.0 cm long strings, as shown in Figure P19.64. Each wire carries the same current I, causing the wires to repel each other so that the angle between the supporting...
  3. C

    Solve "Wires and Currents" Homework w/ Answers

    Homework Statement Two very long straight wires carry currents perpendicular to the page. Wire 1, which carries a current I1 into the page, passes through the x-axis at x=+a. Wire 2, located at x=-2a, carries an unknown current. The net field at the origin (x=0), due to the current-carrying...
  4. ShawnD

    How can wires carry analog signal?

    Digital Cable seems to be a newer thing, which would imply cable TV up to this point has been analog. How? How can a cable accurately carry an analog signal, probably based on voltage, if cable length greatly affects voltage? Wouldn't that cause all sorts of crazy problems such as things...
  5. J

    .Comparing Wave Reflection in Strings and Wires

    Hi I have a question about pulses in a wire. If I have a single wire of length X and I send a pulse through the wire, when the pulse gets to the end of the wire, does it reflect back with the opposite phase or in phase when the original pulse? I'm trying to visually compare the behavior with...
  6. L

    Understanding Nano Wires in Chemistry: Easy-to-Read Notes and Articles

    I know this might be Physic stuff but, we are doing Nano Technology in Chemistry so that is why I am posting it here. What I would like is some notes and article on this subject and it should be something eaisly understandable, not something hardcore stuff with a lot of formulas. If you have...
  7. J

    Understanding the behavior of E fields inside wires

    Hello All, I'm currently trudging through my physics class which is teaching about electric and magnetic fields, and their interactions. As I have been reading through the textbook, I have been trying to formulate ideas and understand exactly what is happening inside of current carrying...
  8. M

    Two wires in parallel and capacitence

    I have to show that the capacitance per unit length for two identical wires of radius d separated (at the center) a distance D as: C/l = (pi epsilon0) / ( ln [( D - d ) / d] And I'm clueless. How do I go about solving this? I started by trying with C = q / V to C = lambda * l / V .. but I...
  9. E

    Magnetic forces on two current carrying wires

    "Find the force per unit length on each of two long, straight, parallel wires that are 24 cm apart when one carries a current of 2.0 A and the other a current of 4.0 A in the same direction." Tell me if I'm doing this right: I use d = 0.24m, and the equations B = (mag. perm. * I)/(2*pi*d)...
  10. M

    Magnetism and Current Carrying wires (?)

    Magnetism and Current Carrying wires (?) I have a homework problem my teacher gave and warned us it was "Very difficult". I've tried drawing out the forces and i think i have made some headway but the vector-nature of magnetism confuses me... For example, i see in some solutions the forces...
  11. D

    Electromagnetics - Two long wires carry equal, but opposite currents

    Another Electromagnetics question... Two long wires carry equal, but oppositely directed, 25 A currents. What is the magnitude of magnetic field due to these currents at point P? The wires are 0.1 m apart and point P is 0.05m in between the wires. Would the following be the correct way to...
  12. J

    Magnetism and perpendicular wires.

    how do i find the b field of two perpendicular wires. suppose one wire is pointing out of the page and the other one is going from left to right. I am looking for the magnetic field between them. o (wire going out of paper) B=? xxxxxxxx (wire going left to right)
  13. O

    Deriving Magnetic Field of Two Parallel Wires on the X-Axis

    Hello guys. I just had a question about the below problem. I am not sure if this is right but more likely it is wrong. I have been trying this problem for an extensive period of time now. If anyone could help out I would greatly appreciate it. Following the dashed lines I showed the work...
  14. D

    Treating parallel electromagnets as current carrying wires.

    Right I'm doing a piece of work that needs a simple question answering. If you had two parallel electromagnets, between them a metal sheet that is being constantly vibrated with the electromagnets being used to dampen these vibrations, can you treat them as two current-carrying wires and use...
  15. K

    Understanding Absolute Error & Resistance of Wires

    :confused: Anyone can explain to me what Absoloute Error is and what this means: Worst case % error = Absolote error/ Smallest reading * 100 For Voltmetre ______ % For Ammetere ______ % For Length _______ % For Diametre _______% _________________ Overall % error...
  16. S

    Em question - effects of wires

    I'm a little confused about what happens when we connect two objects by a wire. Does this just equal the potentials, or does it equal the charges? Also, does this depend on the nature of the objects (is it different for e.g conductors or capacitors?) thanks for your help
  17. B

    Noobe, need some help in power drop along long wires

    Hi, I am new to the forums here, I have a radar detector that I want to hardwire and remotely view the lcd in my rear view mirror. I'm using cat5e cable to make the connections, the length is about 8'. I finally got the lcd in the rear view mirror and soldered all the connections. It...
  18. D

    The Hall effect and the magnetic force on current carrying wires

    As I understand it, a current flowing through a conducting strip in a magnetic field perpendicular to the current will drift to the side creating an electric field that corrects the currents motion and creates a potential difference across the conductor. Why then does a current carrying wire in...
  19. C

    SHV Connectors for PMT Wires

    I am currently working on a project in which photomultipliers are used. Specifically, they are Hamamatsu R6233HA models. In order to test these tubes, I have to connect the wires to a high voltage source. The problem is the wires are .110 inch in diameter and are not connected at the ends, so I...
  20. I

    Get the resistance for each wires

    One day when the familiy Jones is out and drives with his new car wonders Oskar why there is a lot of wires in the backwindow. The heat wires are parallelwired where the resistance is resistance free wired. Oskar and his father reads in the instructionsbook that the wires got a resistance...
  21. M

    Wires Magnetic field question

    Two long straight wires piece on the plane of the paper at vertices of an equilateral triangle. They each carry 2 A, out of the paper. The magnetic field at the third vertex has a magnetic of...? The third vertex is the top of the equilateral triangle. I don't know what equation to use to...
  22. J

    How Do Currents in Adjacent Wires Affect Their Mutual Force?

    Hi, My Question: A rectangular loop of wire lies in the same plane as a straight wire, as show in Fig. 20-57. There is a current of 2.5A in both wires. Determine the magnitude and direction of the net force on the loop. http://www.webassign.net/pse/p31-09.gif" where the width is...
  23. T

    Help Solving a Problem with Cylindrical Wires: Magnetic Force Calculation

    Could anyone please help me with the following problem? A compact package contains n = 100 long straight wires, shaped like a cylinder with a radius of R = 0.500 cm. If each wire conducts i = 2.00 A, calculate the intensity and direction of the magnetic force per unit of length acting on a...
  24. W

    Calculate Magnetic Field Between Two Wires: Help Needed

    Ok, I have been working on this problem for about 2 hours now, and I still can't get the right answer..could someome help me? two wires carry currents of I=5.12A in opposite directions and are separated by a distance of d0=9.33cm. (the wire on the left has I going up and the one on the right...
  25. W

    Net magnetic field in wires

    Ok, I have been working on this problem for about 2 hours now, and I still can't get the right answer..could someome help me? two wires carry currents of I=5.12A in opposite directions and are separated by a distance of d0=9.33cm. (the wire on the left has I going up and the one on the right...
  26. F

    Circular motion of two wires and a ball

    circular motion! two wires are tied to a 200g ball. the ball revolves in a horizontal circle at a constant speed of 7.5 m/s. what is the tension in each wire. | |' | ' | ' | 'O | ' | ' |' |
  27. D

    Direction of Magnetic Field in Parallel Wires

    If you have two parallel wires, each producing a magnetic field, what would the direction of the magentic field be if: 1) Current flowed in the same direction in each wire. 2) Current flowed in opposite direction in each wire.
  28. P

    Calculating Magnetic Field Between Parallel Wires with Opposing Currents

    I've been studying for my exam and came across this little problem. Two parallel conductors each carry 10 A of current in the same direction. a) What is the magnetic field strength at the midpoint between these wires? b) What is the field strength at the same point if the current ran in...
  29. J

    Determine the magnetic field between 2 long straight wires

    determine the magnetic field between 2 long straight wires 2cm apart in terms of the current (I) in one, when the other carries 15A. Assume currents are in the same direction. okay so if they're in the same direction the field should be up now I'm guessing I should use (4pi x 10^ -7)/(2pi)...
  30. B

    Where is the neutral point between 2 wires

    There are 2 long wires A and B, placed 10cm apart. The currents in 2 wires are the same, 0.3A downwards. Where is the neutral point, how far is it from wire A?
  31. C

    How Does the Angle Between Two Supporting Wires Affect the Tension Force?

    If two wires are holding a 500N weight up, will the tension force in each rope be greater if they are both held taught to the side than if they are both simply holding it straight up? For holding it straight up, the tension force is simply 250N in each, derived from 2Ftsin90 - 500 = 0. To find...
  32. V

    Magnetism: Magnetic force between wires

    Magnetism: Magnetic field between wires Two long parallel wires are a distance of d = 1 cm apart and carry equal antiparallel currents of 8 Amperes. Find the magnetic field intensity (in T) at the point P which is equidistant from the wires. (R = 10 cm). This should be easy but I haven't...
  33. V

    Magnetc force from current-carrying wires - help

    In the figure below, a long straight wire carries a current of 8.5 Amps. (Attached) Find the magnitude of the net force (in N) on a rigid square loop of wire of side, L, equal to 5.35 cm. The center of the loop is d = 10.40 cm from the wire and the loop carries a current of 10.0 Amperes...
  34. N

    Question about wires connected in series .

    question about wires connected in series... Hi everyone, i was wondering if anybody here can help me out on a homework problem. The question states: Two long straight wires are suspended vertically. The wires are connected in series, and a current froma battery is maintained in them. What...
  35. S

    One Question about Long wires and Mag fields, want to verify please.

    Hello, I have this problem and I want to verify if somebody thinks I did it right. The figure shown below shows an infinitely long wire carries current I1 = 20A. A short wire of length 9cm lies perpendicular to the direction of the long wire. The nearest end of the short wire is 3 cm away...
  36. T

    Physics Assesment : Copper wires resistance

    Hi. This may seem extremely easy for all you guys here but seeing as I am 15 its not quite as simple to me. Firstly the assesment I am going to be doing will count for my GCSE therefore i want the best possible result (Btw I am taking triple science) Can someone with as much detail as...
  37. E

    Understanding the Relations between Welding Wires, Voltage and Metal Specifications

    May I Ask This Question ... Please ... There is many sizes of Arc Welding Wires ... ( 1.5 ) , ( 2 ) , ( 2.5 ) ... etc. On what depend exactly the use of each size ... ? There is also on the Welding Machines a Volatge Controller ... for increasing or decreasing the welding voltage ...
  38. S

    B field btwn two current carrying wires

    I just had a quick thing i wanted to clarify... The question was: If u have two horizontal parallel current carrying wires 196 cm apart, with the bottom wire carrying a current of 2.2 A to the west and the top 1.1 A to the west, what is the magnetic field at the point P? Point P being the...
  39. K

    Magnetic force between 3 straight wires

    Find I2 so that the magnetic force per unit length on each wire is zero. The three parallel wires are equally spaced. Current directions are shown with '<' or '>'. I1 = I3 = 1 A < I1 < I1 < I1 --------------- > I2 > I2 > I2 --------------- < I3 < I3 < I3 --------------- I have...
  40. U

    Calculating Total Resistance & Tolerance of 2 Wires

    If there were 2 wires, and one of the wire has a resistance of 50 Ohms with a tolerance of 5%, while the second wire has a resistance of 60 Ohms with a tolerance of 3%. The total resistance would be 110 Ohms but what about the total tolerance? Would it be 8%?
  41. tandoorichicken

    Calculating Currents in Parallel Wires: Exploring B-Field Repulsion

    Two parallel wires repel each other with a force per length of 1.00*10^-3 N/m when spaced a distance of 2.50 cm apart. If one wire has a current of 100A, what is the current in the other wire? Don't know where to start this one.
  42. S

    Mutual resistance between two wires

    I want to be able the calculate the mutual resistance between two wires, where one wire is horizontal and the other is vertical, i am using the theory developed by G. A. Campbell Physics review 1915 "mutual inductances of circuits composed of straight wires"
  43. D

    Tungsten wires of all electric light bulbs

    I'm looking for a jump start with this one. I'm having trouble getting started. The tungsten wires of all electric light bulbs are designed to glow at about the same temperature. This requires, as a first approximation, that the power per unit surface area of the filament be the same for...
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