Wires Definition and 524 Threads

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...

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...

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...

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...

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...

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...

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?

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...

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

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...

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...

what are neutral wires and their colours?

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...

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) ^ |...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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 /...

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...

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...

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 =...

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...

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...

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?

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...

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...

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?

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...

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...

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...

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...

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...

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 =...

Homework Statement Shown at right is a cross-sectional view of two long straight wires that are parallel to one another. One wire carries a current out of the page; the other carries an equal current into the page. I don't know how to show the diagrams, but the current into the page is at...

Homework Statement Wires A and B, having equal lengths of 40.0 m and equal diameters of 2.60 mm, are connected in series. A potential difference of 60.0 V is applied between the ends of the composite wire. The resistances of the wires are 0.127 and 0.729 , respectively. Determine: (a)...

Homework Statement The circuit shown above consists of a single battery, whose emf is 1.4 V, and three wires made of the same material, but having different cross-sectional areas. Each thick wire has cross-sectional area 1.4e-6 m2, and is 21 cm long. The thin wire has cross-sectional area...

Homework Statement Two infinitely long wires are separated by a distance of d = 1.4 meters. Both have current running in the positive y direction. A charge of q = +2.7 micro-Coulombs is moving in the positive y direction at v = 3.1 E 6 m/s a distance of r = 0.22 meters from the wire on the...

Homework Statement Two wires have current both running in the positive x direction as shown in the diagram with I1 = 13.9 amps and I2 = 4.5 amps. They are separated by a distance of d = 4.7 meters. A third wire with I3 = 10 amps is placed somewhere between the two wires with current running...

Hey all, What I'm trying to do is find a way to affix a wire or group of wires to the frame of an FSAE car to keep them out of the way. Last year this was done by either tie-wrapping the wires to the frame (tie wrap around the frame tube & wire) or with electrical tape by the same manner...

Recently in physics I've learned that equipotential surfaces are always conductors in electrostatic equilibrium.. so no moving charges. I'm a little confused, then, of how a wire carrying current is considered an equipotential? If charges are moving how can the potential be constant?

Recently in physics I've learned that equipotential surfaces are always conductors in electrostatic equilibrium.. so no moving charges. I'm a little confused, then, of how a wire carrying current is considered an equipotential? If charges are moving how can the potential be constant?

Homework Statement Two current carrying wires cross at right angles (like a + sign). Wire 1 has current directed horizontally to the left. Wire 2 has current directed vertically up. If the wires are not restrained, what statement best describes the motion of the wires? A) Wire 1...

Homework Statement Two infinitely long parallel straight wires carry currents in the +- z direction as shwn in the figure below. Each wire is located on the x-axis a distance of a from the origin. a) Determine B as a function of y along the line x=0 b) Sketch a graph of B vs. y along the...