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. Hyo X

    Induction - in two parallel wires - affecting voltage?

    Hypothetical, Two parallel wires, wire 1 and wire 2. Trying to understand my system. A) Wire 1 has a constant current which is being driven by a V and power supply. Is there a current in wire 2 if the current in Wire 1 is constant? B) Wires A and B both have current flowing through them. Does...
  2. EternusVia

    Data Corruption from Sensors with Long Wires

    Hi all, Hopefully this is the right subforum. I have a question related to Arduino sensors. Q:Generally, when do you need to be worried about losing data from having long wires from your sensor to your Arduino board? Details:For example, I've been looking at two sensors. Sensor 1: MLX90614...
  3. J

    AC and polarity of hot and neutral wires

    I'm a bit confused as to how only one wire changes it's polarity in an alternating circuit. I also checked out a previous thread (https://www.physicsforums.com/threads/how-can-polarity-of-ac-inverse-but-keep-the-live-hot-and-neutral-cold.752605/) and didn't find a sufficient answer. I found this...
  4. J

    When current flows through 2 parallel wires (same amount of current)

    when current flows through 2 parallel wires (same amount of current); the protons in the first wire would see the electrons drifting in a direction and also in the other wire (in the same direction). They would appear to be contracted in the direction which they flow due to length contraction...
  5. skepticwulf

    Understanding Power Dissipation in Electric Wires

    In a general homework question I often encounter terms like "a wire of resistance R is stretched, what factor the power dissipated changes?" What exactly is this power dissipated ? Is it the one "wasted away" by heating up the wire due to the wire's resistance? or is it the power "used up" or...
  6. S

    Capacitance between two parallel wires not straight

    Hi, I would like to know how to calculate capacitance between two wires which are parallel but not necessarily straight.for instance the two wires might be parabolic..I would like to calculate for such general structures.i.e) two parallel wires that are not necessarily straight. Thanks in...
  7. toforfiltum

    Calculating combined resistance of wires

    Homework Statement Homework Equations R ∝ 1/A The Attempt at a Solution Since there are six copper wires and a steel core, I added the resistance of all the wires and the core and divided them by 7, though I don't think my approach is right since the resistance of the copper and steel...
  8. W

    Magnetic fields out of long wires

    Homework Statement Assume that I = 5.0A. What is the magnetic field at point b in the figure? Give your answer as a vector. Homework Equations Ampere's Law - B = (μ0I)/(2πr) The Attempt at a Solution I tried plugging the given numbers into Ampere's Law for point b, which gave me B =...
  9. A

    What is the Magnetic Field at Point P due to Two Parallel Wires?

    Homework Statement Two long thin parallel wires a distance d = 14.6 cm apart carry 25-A currents (I) in the same direction. The magnetic field is measured at point P, a distance d1 = 12.1 cm from the lower wire and a distance d2 = 5.8 cm from the upper wire. a. Find the x and y components...
  10. A

    Resistance of Electrons in Wire: Factors & Theories

    I'm not sure if this question has already been answered yet. I was curious what factors effect the resistance of electrons moving through a wire? From the formula R = p*(L/A) i see mathematically why but I'm curious to the theoretical. Does an increase in cross sectional area decrease the...
  11. A

    Magnetic Field of Four Parallel Wires

    Homework Statement Four long straight wires located at the corners of a square of side l = 27.8 cm carry equal currents I0 = 16 A perpendicular to the page as shown in the figure above. Determine the magnitude of B at the center of the square. Homework Equations B=mu0/2pi*I/r The Attempt at...
  12. GoldWing

    Magnetic Levitation magnitude of current

    Homework Statement Three long parallel wires are a distance L = 5.71 cm from one another. (Looking at them, they are at three corners of an equilateral triangle.) The top wire has a diameter of 1.8 mm and is made of copper; it is suspended in air due to the magnetic forces from the bottom two...
  13. mooncrater

    Two oppositely charged wires and their capacitance

    Homework Statement Two long wires with the same cross section are arranged in air PARALLEL to each other . Assume both have opposite charge densities +λ and -λ. The distance between the axis of the wire is η times larger than the radius(r) of wires cross section . What would be the capacitance...
  14. R

    Resistivity of two copper wires using valence shell information

    Homework Statement Homework Equations Please see below. The Attempt at a Solution From my thread in the Solid State section (and input from DrDu): The Thomas-Fermi wavevector relates to the damping of an electric field caused by build up of carriers around an impurity (screening). Where...
  15. Roynish

    Working out power loss in power lines: Multiple wires

    Hey everyone, This is quite a simple question, I think I'm just getting confused. 1. Homework Statement Given Data: Merlin: Resistance: 2 Ω / km, Maximum Current: 519 Pelican: Resistance: 1.5Ω/km, Maximum Current: 646 Penguin: Resistance: 4 Ω/km, Maximum Current: 357 Sparrow: Resistance...
  16. Essence

    Conservation of Energy for Parallel Wires

    Homework Statement So I'm trying to prove to myself that energy is conserved in the case of magnetism. Here is the set up that I'm using to get that understanding (attached image). Just to be clear the arrows represent the current lines and I am calculating a gain in PE because if I release...
  17. David21

    Magnetic Force Between Current-Carrying Wires

    Homework Statement : [/B] Three parallel wires of length l each carry current i in the same direction. They’re positioned at the vertices of an equilateral triangle of side a, and oriented perpendicular to the triangle. Find an expression for the magnitude of the force on each wire. Express your...
  18. W

    What is the Inductance of Parallel Wires in a Circuit?

    1. Two wires running parallel to each other in a circuit can provide an inductance that is adjustable with their length. For the loop shown below with length L=2m , width w=5cm , and wire radius a=1mm , find the inductance in H?Homework Equations3. I thought i could find the inductance by...
  19. D

    Force on 2 wires near each other with current

    Homework Statement Two wires are placed parallel near each other in free space at a distance of d=0.08m. They have a length of L=0.4m and each carry a current of i=3.7A (in the same direction.) Find the force exerted on each other. Consider attraction as positive force and repulsion as a...
  20. J

    How do you get 2 wires on AC out of phase by 180 degrees?

    Thanks
  21. P

    Why Does Increasing the Cross-Sectional Area of a Wire Reduce Heat Dissipation?

    The power dissipated in a resistor of resistance ##R## with current ##I## passing through it is ##I^2 R##. We can write ##R## as ##\rho \frac{L}{A}## where ##L## is the length of the wire and ##A## is the cross sectional area of the wire. Clearly, increasing ##A## decreases ##R##. Why is less...
  22. R

    Force between Parallel Wires: Calculating Resultant Force

    1. The problem statement, all variables and given/known Two long parallel vertical wires 0.3m apart are. ' placed east-west of one another. The current in the westerly wire is 30A and on the other 20A. The horizontal component of the Earth's magnetic flux density is 2*10^-5. Find the force per...
  23. D

    Parallel wires carrying current out of the page, find B

    Homework Statement Two parallel wires are a distance 2 b apart from the origin and carry current I out of the plane of the paper. Find the magnitude and direction of the magnetic field B(y) along the y axis. Homework Equations ∫B⋅dl=μI[/B] The Attempt at a Solution If we take ∫dl = 2πr...
  24. A

    Electromagnetic induction of two wires

    I have two wires in parallel at a distance r apart. They are unequal in length. The current carrying primary generates a magnetic field B at distance r. What is the area related to the secondary through which B passes? Is it correct to assume the thickness times the length of the secondary? All...
  25. G

    Digital Transmission and Twisted Wires

    Homework Statement I am currently embarking on a project where I have to build a communications system which can take in an analog voice signal, translate it into digital signal, and send it across to the receiver where the original voice gets recovered and it can be played back using a...
  26. T

    Synchronize a dc pulse through an array of parallel wires

    Hi everyone, my question is related to producing a magnetic field from an array of straight parallel wires. In my scenario, imagine the wires as being stacked into a regular array similar to the way a pile of lumber is usually stacked, so that the ends are exposed, eg: ====================...
  27. A

    Magnetic field and parallel current-carrying wires

    could someone explain question 10. JUST PART b)iii) http://mrmackenzie.wikispaces.com/file/view/AHpastpaper2004.pdf I got the magnitude of the magnetic field but I don't know how to find its directionI thought it might be to do with left and right hand rule? the answer is upwards could...
  28. D

    Two parallel wires carrying currents in the same direction.

    Homework Statement Two parallel wires both carry currents directed from left to right. A circular wire loop lies in the plane of the two wires midway between them. The currents are positive charges. Sketch the changes in the magnetic fields induced and the resultant current direction in the...
  29. R

    Okay to twist thermocouple wires?

    I am trying to make some K-type thermocouples. I have wire. Is it okay to twist the ends together at the sensing tip? There is no tension in the wires, so is it okay? I don't see why everyone says to weld them or solder them. I don't have a welder and the solder won't stick (yes I used flux).
  30. Samurai44

    Compass Behavior Near Parallel Current-Carrying Wires

    Homework Statement two wires are parallel to each other,carries current of same magnitude, and the distance between them is 10cm ,, wire A carries current out of the page ,, Wire B carries current into the page ... A compass is placed at 4 cm from wire A .. Where does the needle point ? I...
  31. D

    Hooking Up Two Inverter Generators, Its Done, Just Wires?

    Hello, http://www.powerequipmentdirect.com/Reliance-Controls-GPK30RV/p1893.html Reliance Controls Sidewinder™ Parallel Power RV Cables is an example of this. That one is universal. Honda makes same thing for their invertor generators, plug two 2,000 watt together to get 4,000 watts...
  32. greggo

    Can I hardwire 12v light to my 110v house wires?

    I have a strand of 12v led lights that I'd like to use as under mount lights for my kitchen cabinets. Is there a way to hook the lights up to my existing 110v wiring assuming there is a converter necessary?
  33. B

    Sizing wires for a photo flash

    Hi all. Please pardon the amateurish question! My hobby is constructing camera traps which I use to photograph wildlife, using small "point-and-shoot" compact cameras. Currently I am working on a project that involves removing the flash unit from the camera proper and installing it...
  34. S

    Two long wires carrying current

    Homework Statement Two long wires carrying current I1 and I2 in opposite directions pass through a closed path S as shown in the picture. What are the values of ∫B⋅ds and ∫E⋅ds if: i) I1=I2=1A ii) I1=1A and I2=0A? Homework Equations Ampere's Law: ∫B⋅ds=μ0I Faraday's Law: ∫E⋅ds=-dΦB/dt The...
  35. S

    Two very long parallel wires 1.0m apart lie on the ground

    Homework Statement Two very long parallel wires 1.0m apart lie on the ground carrying currents 4.0A and 6.0A in the same direction. How far from the 4. wire are the magnetic field completely cancelled? 1.0m on the other side of the 4.0A wire, what is the magnitude of the magnetic field...
  36. M

    Magnetism: Forces between two parallel wires

    Homework Statement Two long, straight wires with a current of 8.2A on the left and 9.3A on the right flowing in the same direction. The distance between the wires is 8.8 cm. a) What is the magnitude of the force per unit length between these two wires both in length and direction b) How far to...
  37. Jyothish

    Charge reconfiguration on wires connnected to capacitor

    Consider a capacitor which is charged to a certain voltage 'V' and having a total charge 'q' in it.The leads of the capacitor are connected to ideal conducting wire strips.Now if I introduce one conductor slab between plates of the capacitor, without touching the plates,as we know from basic...
  38. S

    Why do we need two wires for electricity?

    I know the circuit must be complete in order for devices to work. I want to understand this with an analogy in reference of a battery. Let there be a bulb in the circuit connected to a battery. Now if circuit is closed then what happens in the circuit? Electrical energy lights up the bulb so is...
  39. C

    Find Out Why Orientation C is Least Likely to Break Wires

    Homework Statement Three pictures of equal weight (20 N) are hung by wires in three different orientations. In which orientation are the wires least likely to break? Orientation A: 15 degree with horizontal,Orientation B: 45 degree angle with horizontal, Orientation C: 60 angle with horizontal...
  40. M

    Another vector problem -- A ball suspended from 3 wires

    Question A ball with a mass 4 kg is suspended from 3 light in-extensible wires (diagram given) Given that the ball is in equilibrium, calculate the tension in each of the wires. My attempt T1 is equal to the weight of the ball which is 4g so T1 = 4g From there I don't know what to do but for...
  41. C

    Van der waals attraction between 1-D wires

    Homework Statement Consider two infinitesimally thin (i.e 1-D) wires of equal length ##L##, and at mutual distance ##d##. Consider the two configurations shown in attachment Estimate the van der Waals interaction between the wires, for ##d \gg L##, in the two situations where: (i) the wires...
  42. C

    Perpendicular wires carrying current, torque

    Homework Statement Two thin wires of length L_1, L_2 were placed perpendicular to each other in half of their lengths. Wires are carrying current I_1 and I_2. Find the torque on each of those wires. Homework Equations \tau = \mu \times B = r \times F The Attempt at a Solution To...
  43. 2

    Force between two parallel wires carrying current?

    There is something I am confused about when it comes to the force between two parallel wires carrying current, specifically why when they carry current in the same direction the wires are attracted to each other. I understand that when you use Flemming's left hand rule and consider the electrons...
  44. J

    Understanding Magnetic Field Direction from Two Wires at a Distance

    You have two wires an equal distance above and below the x-axis the top wire comes out of the page and the bottom wire goes into the page. Finally, consider point X (not shown in the diagram) located on the x axis very far away in the positive x direction. Which of the vectors best represents...
  45. C

    Net magnetic field due to two wires

    Homework Statement The two wires shown in the figure carry currents of I = 5.58 A in opposite directions and are separated by a distance of d0 = 8.43 cm. Calculate the net magnetic field at a point midway between the wires. Use the direction out of the page as the positive direction and into...
  46. J

    Can you use multiple wires to wind a solenoid?

    I am curious if an alternating solenoid coil needs to be wound with a single piece of wire from end to end, or - can each loop in the solenoid be made of a separate wire and stacked on top of the previous, as long as each termination is connected to the proper + / - terminal. Essentially - is...
  47. rotflqtms

    Adding 3 new wires to 1 fuse in fuse box in car

    I wanted to install a few cigarette lighters in my old 1996 Toyota Camry that my sister just gave me since it only comes with one, and I want to have a dash cam/parking cam AND to charge my phone, and while I'm at it, add one in the back. I located the fuse box, and will find an accessory fuse...
  48. J

    Can Ohm's Law be applied to all types of devices and power sources?

    Hello, I am pondering a topic and i can't quite find the answer that i am looking for. It concerns amp draw. I understand ohms law and the relationships it entails. I am confused with the idea that people say a device will draw more amps than it is supposed to and cause things to burn up. I...
  49. M

    Archived Lenz' Law Scenarios for two wires with varying distance between them

    Homework Statement For each of the following scenarios, predict the direction of the induced current ( c-to-d; d-to-c; NO INDUCED CURRENT) in the second set of coils, N2. 1. The current, I1, direction ‘a-to-b’, is increasing rapidly. The coils remain stationary. 2. The...
  50. kartikwat

    Electric current in household wires

    See, we know that different electrical appliances in our house require different amount current to work .now first if some appliance is working which requires less current then less current will be passing through wires but when we use electrical appliance which uses high current then high...
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