What is Wire: Definition and 1000 Discussions

A wire is a single usually cylindrical, flexible strand or rod of metal. Wires are used to bear mechanical loads or electricity and telecommunications signals. Wire is commonly formed by drawing the metal through a hole in a die or draw plate. Wire gauges come in various standard sizes, as expressed in terms of a gauge number. The term 'wire' is also used more loosely to refer to a bundle of such strands, as in "multistranded wire", which is more correctly termed a wire rope in mechanics, or a cable in electricity.
Wire comes in solid core, stranded, or braided forms. Although usually circular in cross-section, wire can be made in square, hexagonal, flattened rectangular, or other cross-sections, either for decorative purposes, or for technical purposes such as high-efficiency voice coils in loudspeakers. Edge-wound coil springs, such as the Slinky toy, are made of special flattened wire.

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  1. U

    Electric field intensity 'inside' a wire carrying current

    I am new here and asking question for the first time of course. My question is very simple. Does electric field intensity exist 'inside' a wire carrying current? Please explain the answer.
  2. S

    How do i build a electronic wire strippers?

    Hi i work at mission central tearing down computers and other electronics plus i look for electronics at the curb that people threw out. I was wondering if i can make a wire strippers that will strip many size wire and also feed it through by itself or with a little help. I want to make it with...
  3. N

    Winding Copper wire / strip on Aluminium body

    Hello All, Greetings. I am new to this forum. I am working for a heater project, in which we use plastic (PA66) over molded on aluminum (6061-T6) body for melting corrosive liquids (similar to sea water). The Aluminum body is heated by means of Positive temperature coefficient material (PTC)...
  4. A

    Linear movement detector using magnetic, wire coil and transistors

    Hello, I have cool idea for a device and one hardest part of it is to detect the movement of the object. I think I can use a wire coil, and a small magnet attached to the moving object. When the object passes the wire coil (up or down), there will be small voltage inside the wire coil. It...
  5. I

    Hand rule used to find the magnetic field in a single loop wire

    what rule hand rule shall be use in determining the direction of magnetic field in a single circular loop..pls. help me
  6. M

    Can a magnetic fields/forces do work on a current carrying wire?

    I'm just confused... I know that magnetic fields can do work only on pure magnetic dipoles like a bar magnet. Based on the formula, the magnetic force on a charge is qv⃗ ×B⃗ which is identically perpendicular to v⃗ and that's why it does no work. However, forces on magnetic dipoles and more...
  7. J

    Is two way communication possible over same wire

    I have a question in my mind whether two way communication is possible over same wire. For example, suppose you have a coaxial line which is used to send information from A end to B end. Now, Is it possible that B sends info to A simultaneously when A is sending info to B?
  8. I

    How Does Doubling the Current Affect the Compass Needle's Deflection Angle?

    Homework Statement A conducting wire runs directly over a horizontal compass in the north-south direction. When a current of magnitude I passes through the wire, the compass needle swings 20° to the west and stays in that position. When a current of 2I passes through the wire, the compass...
  9. H

    Why is the misconception of zero inductance for a straight wire so widespread?

    It is zero, contrary to published formulas. I assume that we are talking about a single wire, not about a twisted bunch of wires. Why is the misconception so popular?
  10. S

    Can You Replace a Firewire Port with a USB Port for an External Hard Drive?

    Can you unsolder a firewire ports pins on the green board and solder a usb port in its place?
  11. S

    Question on wiring fire wire to usb wire?

    Can i wire fire wire to usb wire? What i mean is cut one end off on a fire wire and one end off a usb wire and wire the two together would that work?
  12. A

    Bead on wire tilted at angle theta.

    Homework Statement Consider a bead of mass m constrained to slide without friction along a rigid wire that rotates about the vertical at a fixed angle \theta with constant angular velocity \omega. Write down the Lagrangian in terms of z as the general coordinate. Find the equation of motion...
  13. V

    I get shock when I touch Grounding (earthing) wire

    Hello experts. This is a unusual behaviour. I moved to new house, an apartment newly constructed less than a year old. I first noticed shock when I was disammbling my computer , i immediately took out multimeter and tester. First checked with tester, it did not show any symptoms of...
  14. S

    What exactly do electric waves transfer from one point of the wire to other?

    so basically i was considering the speed of the charges inside wire defined by the drift velocity and speed of electric waves that's equal to speed of light..so my point is if electric waves don't carry any charge (as mostly light that we encounter from sun's radiation is em and since they don't...
  15. A

    Maximum distance of charge from current carrying wire

    Lets have a charged particle at a distance x at the beginning with velocity v away from a current carrying wire with current I. So, what will be the maximum distance of the particle from the wire? (only consider magnetic field)(wire is of infinite length) There are two ways of solving the...
  16. A

    Stretched wire potentiometer, Conceptual help

    I am having problem understanding the working of Stretched wire potentiometer. Now the book says that the potential of a and A are same because the wire Aa has negligible resistance. That is were the problem comes for me. Suppose the batter connected to AB be of 10V (assume negative terminal...
  17. C

    A wire segment 1.2 m long carries a current I = 3.5 A

    Homework Statement A wire segment 1.2 m long carries a current I = 3.5 A, and is oriented as shown in the figure. The +x-axis points directly into the page. A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown. What is the magnetic force vector on...
  18. P

    Resistance of a copper wire

    Homework Statement A 10-g piece of copper is to be formed into a wire of radius 1.0 mm at a temperature of 50° C. What is the resistance of this wire? (Hint: you will need to look up the density of copper.) If a potential of 12 V is put across this wire, what is the drift velocity...
  19. Saitama

    Beads on Semi-Circular wire

    Homework Statement Two beads A and B move along a semicircular wire frame as shown in the figure as shown in figure. The beads are connected by an inelastic string which always remains tight. At an instant the speed of A is u, angle BAC is 45 degrees and angle BOC is 75 degrees, where O is the...
  20. L

    Force on a long straight wire help

    I'm not sure about the force 3 wires have, here's the question. The question is: "Calculate the force per unit length experienced by the middle wire in the arrangement shown." The thing is I've an overall force of 0 because I1 and I3 are in different directions each producing a...
  21. C

    Why do magnetic fields appear when an electric current passes through a wire?

    I've checked Wikipedia for answers but can't find any. I'm learning electromagnetism in school now. I don't know why this happens and so I can't understand the lessons! Can anyone tell me why? Thx :)
  22. K

    Single Wire Transmission Experiment

    I've done an experiment for Single Wire Transmission using Steve Jackson's plans. I went through a series of tests to show what works and what doesn't work. I have demonstrated that the technology does in fact work but some claims towards how it works may be false so I have left it up to you...
  23. J

    Quotable literature electric field at wire tips?

    Homework Statement Does anybody know where to find a source that describes the electrical field between two opposing wire tips with a small gap between them? The problem is more or less finding a quotable source, not so much solving the problem. Homework Equations Not relevant now...
  24. E

    Force on a wire carrying current

    It is given in my book. hat F=B I l sin theta where theta is the angle between B and the current I... I guess this is no right.. I mean, how would the current make an angle with B, it should b the length of wire itself... Secondly F=Bqv is the reason behind a charged particle which enter...
  25. J

    Charge seperation in a conducting wire

    If I have a conducting wire of length l and a charge separation develops between one end of the wire and the other, will the electric field have a magnitude is equal to: V/l (voltage/length of wire)??
  26. K

    Archived Balanced length of a potentiometer wire

    Homework Statement A battery if emf E0=12v connected across a 4m long uniform wire having resistance 4Ω. The cells of small emf E1=2v and E2=4v having internal resistance 2Ω and 6Ω respectively, are connected as shown in figure below. If galvanometer shows no deflection at the point N, then...
  27. Z

    Magnetic vector potential of finite wire

    Homework Statement The problem statement is attached. The Attempt at a Solution I know how to solve the problem. However, my teachers solutions notes and my book's do it differently, and I want to ask what the difference is, so I have attached them both. My book does it the way I did it. My...
  28. R

    Emf of a Closed Loop of Wire In a Magnetic Field

    ]Homework Statement A closed loop of wire 7.2 x10^{}-3 m^{}2 is placed so that it is at an angle of 60degrees to a uniform magnetic field. The flux density is changing at 0.1 T/s. The emf, in V, induced in the loop of wire is A) 3.6x10^{}-4 b)3.6x10^{}-2 6.9 Homework Equations emf...
  29. Q

    How to find the current in the no resistor wire?

    I can't find the current in the following picture, please help me to find it and show the step, thanks.
  30. E

    Calculating heat loss and conduction through a wire

    I'm creating a project where I am attempting to melt solder paste using the current running through two copper wires, in a kind of lap joint. I'm trying to figure out how much current would actually be going through the wires if I use a 9V battery. I'm not sure where to take into account heat...
  31. C

    Length of wire in a coil of known dimensions?

    suppose that i have a wire with a known thickness ... and i want to wind it around a solid cylinder with known dimensions, and in the end make a coil with the same length as the solid cylinder how do i relate between the length of wire required and the diameter of this coil?
  32. L

    How to determine actual tention applied in a steel wire

    a steel wire has an span of 800 meters,with weight of 1.44 kilograms per meter. how to determine then the actual tension force applied in both ends of the cable? assuming that both ends are in the same elevation. thanks..
  33. I

    Why is the magnetic field around a piece of wire circular?

    I am trying to understand how exactly electric and magnetic fields work. So far this is my understanding. A particle which has charge has an electric field around it. If the charged particle moves, it forms a magnetic field with its force lines perpendicular to direction of the movement...
  34. J

    Behavior of wire subjected by two equal and opposite pulling forces?

    Imagine a wire with uniform circular cross-sectional area and length l. It is being pulled at both ends with a horizontal force that is equal and opposite to each other. The wire obeys Hooke's law up to breaking. (1) How do we calculate the work done by the wire if both sides of the wire...
  35. N

    Why when two conductors connected by a conducting wire gain the same potential?

    Why when two charged conductors connected by a conducting wire gain the same potential . Lets say we have two spheres of different charges why when we connect them by a single copper wire they gain the same potential Thanks in advance
  36. C

    E field outside a current carrying wire

    Homework Statement One step in one of the problems in my book (involving calculation of the Poynting vector) asks to find the electric field outside a wire. This wire is resistanceless and the current is steady. Homework Equations Maxwell's. The Attempt at a Solution Stared at...
  37. Z

    Problem with calculating magnetic flux for a single coil of wire.

    Homework Statement This is more of a general question about magnetic flux in a uniform magnetic field, but I think this is the correct place to post it. I understand that magnetic flux through an area A is the product of the magnetic flux density B and the projection of area A onto a surface...
  38. S

    What shape will a bent wire take?

    Homework Statement Not homework, but something I'm interested in finding out. The setup is a flexible wire with left endpoint fixed at x=0 and right endpoint at x=L. You push the right endpoint with some horizontal force directed towards the left endpoint which will move the right endpoint...
  39. cepheid

    How do I repair my wire in stereo headphones with small, non-conducting wires?

    My headphones had a loose connection. I could make the sound cut in and out of the right ear by bending the cable just above the audio plug. So I set about peeling back the insulation. I thought it would be as simple as soldering the broken wire back together. I was wrong for a couple of...
  40. F

    Magnetic Field square wire loop

    Homework Statement A current I is flowing in a square wire loop of side a. Find the approximate value of the magnetic field intensity magnitude at the point P, which is near to one of the corners in the plane of the square at the same d distance from the near two sides! (d<<a). Homework...
  41. A

    Magnitude and Direction of Induced Current on a wire around a cylindrical volume

    Homework Statement A uniform magnetic field B is confined to a cylindrical volume of radius 0.080m. B is directed into the plane of the paper and is increasing at a constant rate of (delta)B/(delta)t=0.300 T/s. Calculate the magnitude and direction of the current induced in a circular wire...
  42. F

    Long wire problem: Deriving an expression from the Bessel Function

    A straight wire clamped vertically at its lower end stands vertically if it is short, but bends under its own weight if it is long. It can be shown that the greatest length for vertical equilibrium is l, where kl(3/2) is the first zero of J-1/3 and k=4/3r2*√(ρg/∏Y) where r is the radius, ρ is...
  43. H

    Magnetic field by a finite section of wire?

    hey guys i have a question. i solved the problem but i don't understand how to do it. Two perpendicular straight wires join in the ends of a semicircular loop of radius a = 11 cm, as shown in the figure above. If the current I =6 A, what is the resultant field at the center of the circular...
  44. F

    Magnetic Field due to a Long Straight Wire (Proof)

    Homework Statement Whilst revising the Biot-Savart law, I came across the result: for the magnetic field due to a long straight wire. I understand that this can be found by integrating the Biot-Savart equation over the length of the wire, however after attempting the integral myself and...
  45. M

    Emf in a conducting rod moving away from a wire with current I

    Homework Statement A conducting rod of length l moves with a constant speed v perpendicular to an infinately long, straight wire carrying a current I. What is the emf generated between the ends of the rod when it is a perpendicular distance r from the wire? Homework Equations no idea...
  46. B

    Magnetic Flux Through Wire Loop

    Homework Statement A wire loop with radius R is located a distance d from a long straight wire carrying a current I. Find the flux through the loop. Homework Equations B = \muI/(4\pi) Magnetic Field above wire \phi=B*da*cos\vartheta The Attempt at a Solution Somehow you have to...
  47. S

    Magnetic Field near a curving infinite wire in 3d space

    Homework Statement Problem as given: A three-dimensional wire of infinite length carries a current I0 starting at (-∞,0,0) along a straight line to (0,0,0), bending and traveling along a straight line to (0,1,0), then bending and traveling to (0,1,1) and finally bending and traveling out to...
  48. U

    Inertia of pully system with wire that has a mass

    Homework Statement A pully system with a hanging mass is connected to a winch. The goal is to find acceleration of the mass for a given motor torque. The pully sheaves is considered with no friction, but has a given inertia. I have found the inertia of the winch, but I have trouble calculating...
  49. C

    Maximum current through resistor in a coil of wire with two resistors in parallel

    Homework Statement A coil of wire has 600 turns and is 5.5 cm in diameter is in a magnetic field that decreases from 2.2 T to 0 T in 6.2 ms. The axis of the coil is parallel to the field. The coil is hooked up to two resistors of 120 Ω and 200 Ω connected in parallel. What is the maximum...
  50. Z

    Why wire experiences force in magnetic field, when net charge is zero.

    Homework Statement In a current-carrying wire, the total net charge in the metal is zero. Why does the wire experience a force when placed in a magnetic field? Homework Equations The Attempt at a Solution The reason for the force is the motion of the electrons, not their...
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