Wires Definition and 524 Threads

I am lost in the middle of a vast desert in my swim shorts. There is nothing anywhere around me as far as you can see. In front of me is a 12volt battery (say lead acid) with no markings or other indicators of polarity. there are 2 wires long enough to make a connection to the emergency...

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 = -1.10cm and carries a current of 3.50A out of the xy-plane of the page. Wire 2 (right) crosses the x-axis at x = 1.10cm and carries a current of 6.20A...

The diagram (see picture) depicts two long horizontal straight parallel wires that are a distance d=20.36cm apart and each carries a current of 3.25A in the same direction, out of the page. What is the magnitude of the magnetic field at a point that is a perpendicular distance r=30.82cm from...

A long wire carrying a 5.0A current perpendicular to the xy-plane intersects the x-axis at x=-2.0 cm. A second, parallel wire carrying a 3.0A current intersects the x-axis at x=2.0 cm. At what point or points on the x-axis is the magnetic field zero, (a) if the currents are in the same direction...

Homework Statement Two wires are tied to the 200 g sphere shown in figure. The sphere revolves in a horiIzontal circle at a constant speed of 6.80 m/s. http://img684.imageshack.us/img684/6537/knightfigure0761.jpg Homework Equations Ca=m*v^2/r f=ma The Attempt at a Solution I...

Homework Statement The four wires that lie at the corners of a square of side a=5.10cm are carrying equal currents i=2.40Amps into (+) or out of (-) the page, as shown in the picture. Calculate the y component of the magnetic field at the center of the square. Homework Equations B...

1. Homework Statement Two straight wires, each with a resistance of 0.170 ohm and a length of 3.90m, are lying parallel to each other on a smooth horizontal table. Their ends are connected by identical, non-conducting, light springs, each spring having an unstretched length of 1.08 cm. A wire...

NOTE: This is NOT a homework question. I was reading a physics textbook for fun (doesn't everyone nowadays?) and could barely got through the first couple of page the chapter on electric currents because this question was not addressed in the book. Question 1) If you connect the negative and...

wire 1 has a current of 1A directed into the page, wire 2 is 20 cm to the right of wire 1 with a current of 1A, what direction does this current have to flow in order for the magnetic field strength at the mid point between them to be non zero ? from the right hand rule the mag field from...

Homework Statement An underground telephone cable, consisting of a pair of wires, has suffered a short somewhere along its length (at point P in the Figure). The telephone cable is 6.00 km long, and in order to determine where the short is, a techician first measures the resistance between...

Homework Statement A long pair of wires conducts 20.2 (amps) od dc current to, and from, an instrument. The wires are 23mm apart, what is the magnetic field 9.7cm from their midpoint in their plane? Homework Equations B=(µo/2pi)*(I/d) The Attempt at a Solution µo = 4pix10^-7...

Hey guys i have no idea how i would accomplish this, I am pretty sure i would made to make some sort of circuit but what i need it to be able to change where 4 wires go from a momentary switch like these. an example would be to change which usb port a usb cable is connected to by the push of...

Homework Statement Two very long thin wires carrying equal and opposite currents of 103 A are placed parallel to the x-axis at y=0 and z=+-0.5. Calculte the magnetic field B in the x-y plane and determine it's maximum gradient.Homework Equations I'm having serious trouble understanding the...

Current in "ideal" wires. - circuits I am trying to get a "complete" picture of what happens in circuits. I know how to solve typical physics circuit problems using kirchhoffs laws and what not, but I am trying to get a "picture" of what is happening inside of the circuit itself in terms of...

http://img192.imageshack.us/img192/9421/31387291.png I know that the magnetic field coming off the wire will be directed in a circle counterclockwise around the wire. So, from what I understand, it would work something like this: http://img709.imageshack.us/img709/1880/70281684.png...

Hi All, As I understand it, a voltage impressed across a wire produces an electric field within the wire and in the direction of the wire which causes the movement of electrons. If two parallel wires carry a direct current, this field exists in both wires. Now when we talk about...

Homework Statement Two parralel wires are 8 cm apart. The magnetic field halfway between them is 300 uT. What equal currents must be in the wires? Consider parralel and antiparralel currents Homework Equations I use Ia=Ib B = (u*i) / (2*Pi*distance) where distance = 0.04 m (0.08m...

Homework Statement The wires on a violin have a cross section of 5.1*10^-7m^2. The wires are put under tension by turning the wooden pegs. The Young Modulus of Steel is 2.0*10^11 Pa. Calculate the tension required to produce an extension of 4*10^-4m. Homework Equations Thats where...

1. Two Identical wires denoted A & B are part of an electric circuit and therefore carry some currents. The wires are characterized by resistance per unit length,r, and both have length, L, each are spaced by a distance, a. What is the magnitude, F, of the force the wires exert on each other? Is...

1. Two Identical wires denoted A & B are part of an electric circuit and therefore carry some currents. The wires are characterized by resistance per unit length,r, and both have length, L, each are spaced by a distance, a. What is the magnitude, F, of the force the wires exert on each other...

Why is a smaller angle better than a larger angle for a guy wire?

Homework Statement Homework Equations B = \frac{\mu_o i}{2\pi d} The Attempt at a Solution To do this, you'd find the magnetic field magnitude due to the left wire, and add it to the magnetic field due to the right wire. Correct? If so: Wire 1: B = \frac{1.26x10^-6...

Homework Statement A bag of cement of weight 350 N hangs from three wires as suggested in the figure below. Two of the wires make angles θ1 = 50.0° and θ2 = 27.0° with the horizontal. Assuming the system is in equilibrium, find the tensions in the wires. Homework Equations Newton's...

Homework Statement In the picture below, the two wires carry current i1 and i2, respectively, with positive current to the right. The charge q is positive and has velocity v to the right. If i2 = 0 and i1 is greater than zero, then the force on q points into the page. If i1 = 0 and i2...

Tensions in Wires :) Homework Statement A 10.0-kg picture is held in place by two wires, one hanging at 50.0o to the left of the vertical and the other at 45.0o to the right of the vertical. What is the tension in the first wire? What is the tension in the second wire? Homework Equations...

Problem: Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. Wire B has 5 times the cross-sectional area, 1.1 times as many mobile electrons per cubic centimeter, and 2 times the mobility of wire A. In the steady state...

I've tried to find this repeatedly in my textbook, but my teacher told us to ignore the book and then didn't do a great job explaining it, but here goes... A conventional current is flowing into the page (-Z direction) along a straight wire placed at the origin O perpendicular to the page...

I've read that silver is the best conductor of electricity so I am curious why we do not use it in wires like we use gold,copper,etc...

Homework Statement Two long cylindrical conductors (wires) of radii a1 and a2 respectively are separated by a distance d >> a1, a2. Find the capacitance per unit length for the system. If d=0.5cm and a1=a2=a, what must be the diameter of the wires to give a capacitance per unit length of...

Hi Guys, For my design project, I am dealing with a horn antenna that has coaxial wire for the input and output. The problem is, I need to take the signal recived from the antenna by the coaxil and feed it to another circuit, since I need to us a circuit to down convert the freqeuncy or...

Hi, if I have 3 naded wires copper, Tin and Lead wrapped into one cable and I run 12v through it how do I work out the amount of resistance I get and the total voltage at the other end?

Why do they always get so tangled when they're in my pocket? I can put them in there completely untangled, then when I pull them out a couple minutes later, they're tangled up badly.

Hello there PF. I'm currently attempting to repair an old headset of mine that had the cord broken. The only thing is that I can't get the wires to make a connection. I know that wires such as these have a special coating on them that prevents shorts when they're bundled inside insulation bare...

Homework Statement Each current depicted below by an “x” flows into the screen. At which of the following points (A, B, C, or D) is the magnetic force on a charge the largest? A_______B_x___C__D_x______ ------------1---------2 Note that C is equidistant from both wires...

Homework Statement Let two long parallel wires, a distance d apart, carry equal currents I in the same direction. One wire is a x=0 and the other is a x=d. Determine B along the x-axis between the wires as a function of X. Repeat problem if wire at x=0 is 2I and in the opposed direction...

Homework Statement My picture won't upload but there is an x-y plane with point P at (5,4) and a vector shooting off from P in the SW direction. There are two wires pointing into the page (in the z plane) at (5,2) and (10,2). Here is the actual problem: Two very long straight...

Just to know...?? This is no homework,, this is just my effort trying to solve this out... If we ever succeed to transfer electrical power without the use of wires (conduction) would that mean that the speed of light is reached? And If your answer is no, then how come the electric power that...

i have been stuck on this question for two days, can anyone help! A museum of modern art is displaying an irregular 358 N sculpture by hanging it from two thin vertical wires, A and B, that are 1.25 m apart . The center of gravity of this piece of art is located 48.0 cm from its extreme right...

Homework Statement A researcher would like to perform an experiment in zero magnetic field, which means that the field of the Earth must be cancelled. Suppose the experiment is done inside a solenoid of diameter 1.0 m, length 4.0 m, with a total of 5000 turns of wire. The solenoid is...

Homework Statement http://s27.photobucket.com/albums/c191/oscar888/?action=view&current=LONCAPA.gif The four wires that lie at the corners of a square of side a= 3.50 cm are carrying equal currents i= 2.10 A into (+) or out of (-) the page, as shown in the picture. Part A: Calculate...

Homework Statement can someone please help? I am having major problems with physics right now :( Each of the wires carries a current of magnitude I. The current in wire 1 is directed out of the page and that in wire 2 is directed into the page. The distance between the wires is 2d. The...

Homework Statement Calculate the magnitude of the magnetic field at a point midway between two long, parallel wires that are 1.0m apart and have currents if 10A and 20A, respectively, if the currents are a) in opposite directions, and b) in the same direction. Homework Equations µ =...

I'm sorry to post two questions in succession, this is another one on the same topic (I'm obviously having trouble with this whole concept for some reason...) Homework Statement Three long parallel wires are 3.8 cm from one another. (Looking along them, they are at three corners of an...

Homework Statement Two long thin parallel wires 13.0 cm apart carry 25 A currents in the same direction. Determine the magnetic field at point P, 12.0 cm from one wire and 5.0 cm from the other. (Sorry I don't have a diagram, but this is essentially a triangle, with sides of 13 cm, 12...

Homework Statement Two long thin parallel wires a distance d = 15.3 cm apart carry 25-A currents (I) in the same direction. The magnetic field is measured at point P, a distance d1 = 13.3 cm from the lower wire and a distance d2 = 5.3 cm from the upper wire. a. Find the x and y components...

Homework Statement four long straight parallel wires located at the corners of a square of side l=6cm carry equal current I=10A which is perpendicular.Determine the magnitude and direction of B at the center of the square. Homework Equations don't have,so sorry.. The Attempt at a...

Homework Statement Two straight parallel wires carry currents in opposite directions. The wire on the right carries a current of I2 = 11.5 A. Point A is the midpoint between the wires. The total distance between the wires is d = 10.7 cm. Point C is 5.88 cm to the right of the right wire...

Homework Statement Sounds like the beginning to a bad joke right? Two long straight wires pass through a window frame (1m x 1.5m). One wire carries 1A out of the room and one wire carries 8A in. Find magnitude of closed integral of vector B * vector dl around window frame. Answer in...

Hello everyone, as you can tell I'm new and just wondering if I could get some help with this question as I'm not sure where exactly I've gone wrong: Homework Statement Two wires are used to connect a lamp to a power supply of negligible internal resistance. The potential difference...

Homework Statement A packed bundle of 100 long, straight, insulated wires forms a cylinder of radius R = 0.800 cm. If each wire carries 1.50 A, what are the magnitude and direction of the magnetic force per unit length acting on a wire located 0.200 cm from the center of the bundle? 2...