Wires Definition and 524 Threads

Homework Statement Twelve infinite long wires of uniform linear charge density (λ) are passing along the twelve edges of a cube. Find electric flux through any face of cube. (see attachment)Homework Equations The Attempt at a Solution I have actually solved the problem but I think there's a...

Homework Statement I was just wondering, so let's say there are two current carrying wires in the same plane that are perpendicular. One of them is infinite length, the other is a wire segment some distance away from the first one and perpendicular to it. What's the force on the wire...

Homework Statement Six infinitely long parallel wires, each carrying current +I in z direction, perpendicular to the (x, y) plane. They are spaced at angles 2pi/7 around a circle of radius d. A seventh wire, which would make the arrangement symmetric, is missing. What is the magnitude and...

Homework Statement This is not a homework problem, but related to my circuits class. In the typical electrical engineering simplification, the resistance of wires in the circuit is taken to be 0 Ω. Also, the potential difference between two points along the same wire is 0 Volts. Does...

Hello, I'm working on a project at which a large amount of current is being passed through a low voltage system (48 Volts). In one part of the system, there are connectors rated at 12 Volts in which the 48 volt DC current is passed through. How much power loss might I be suffering here...

How do you solve for tension, is there a general formula to use for emample such as this problem(this is not homework, its an example i saw ) you have 2 wires one at 60degrees one at 45degrees both wires have a weight of 5N. find the weight of the third wire that's going down? how does...

conflict: why synchronous machine doesn't produce induced EMF in the DC field wires Isn't it current path through winding which produce magnetic field (rotating) the must produce EMF in the dc winding of field (same theory of induction) but why isn't true in synchronous

Homework Statement Three long, straight wires are carrying currents that have the same magnitude. In C the current is opposite to that in A and B. The wires are equally spaced. Each wire experiences a net force due to the other two wires. Which wire experiences a net force that has the...

Hi all, New here...I was wondering if anyone knows a formula to calculate the (insulation) resistance between two parallel conductors buried in an insulator. For example say 2 copper pins of 1mm diameter spaced 2mm apart over a 20mm length in a plastic (ptfe). The numbers/material are not...

Here's a vector tent problem with the solution. Can someone please explain it to me. https://docs.google.com/open?id=0B7WWo1BlPRXKSTU5WGRLZ2NaX2c

I am toying around with connecting a 236PC 15GW pressure sensor to my arduino board. I am supplying nearly 10 volts to the Sensor and can get +- .1V readings from some simple tests. How do I condition these two lines that give +- .1V to range from 0-5 Volts for the Arduino analog pins.

Homework Statement I have been stuck on the following question for a while now, particularly part B and C, and I'd like some help with it please. I've completed part A already. The Question: (A) Combine the following TdS equations: TdS = C_{v} dT + T\left(\frac{\partial P}{\partial...

Homework Statement Sorry. I know this question is on the forum somewhere, but I still don't get it... Thus. For parallel wires, at the mid-point of the wires, what is the strength of the magnetic field? Do I use the formula B=\frac{μi_{1}i_{2}L}{2∏r}, or is it the sum of B=\frac{μi}{2∏r}...

Homework Statement Two insulated wires in the x-y plane cross at a 30° angle but do not make electrical contact. Each wire carries 3.0 A current (the angle between current directions is 30°). Find magnetic field in two non-equivalent points located 4.0 cm from the intersection, in the x-y...

Hello, My electrician had to disconnect the ground wire from mains distribution box a day ago. And he forgot to attach it back. I did not know it was un-attached. Then in the evening, I touched my computer and got a shock. I used a screw driver type phase tester and checked the ground part of...

Homework Statement This is not a homework problem but I only have permission to post here because I am new. My question is about the electric field in the wires of a simple circuit with a battery and a resistor. Electrons from from lower potential to higher potential terminal battery, meaning...

Homework Statement Hi I am looking at four parallel wires of finite length L, whose currents run in the directions shown in the attached figure. There is no gradient along the wire-axis, so from Maxwell's equation \frac{dB_x}{dx} = -\frac{dB_y}{dy} \equiv \tilde B. In order to find an...

Homework Statement Two long parallel wires are a center-to-center distance of 4.90 cm apart and carry equal anti-parallel currents of 3.70 A. Find the magnetic field intensity at the point P which is equidistant from the wires. (R = 10.00 cm)...

Hi guys, sorry as this is probably a silly question. This isn't homework, but it's something I'm confused about in my GCSE course. If a lattice of ions can't conduct electricity when solid, then why can a wire (composed of these lattices (I think?)) conduct electricity? The electrons in a...

Hi, I always had difficulty with understanding how to determine whether the force between two current-carrying wires is attractive or repulsive. I know that if the currents are traveling in the same direction the force is attractive and repulsive if the currents are traveling in opposite...

A bag of cement of weight 325N hangs from 3 wires as shown in figure (I've attached it). Two of the wires make angle1=60oand angle2=25o with the horizontal. If the system is in equilibrium, determine the tensions of T1, T2, and T3 If you can't see the image, the T1 and T2 are suspended from a...

Homework Statement Hi I am looking at four parallel wires of finite length L, whose currents run in the directions shown in the attached figure. There is no gradient along the wire-axis, so from Maxwell's equation \frac{dB_x}{dx} = -\frac{dB_y}{dy} \equiv \tilde B. How would I go...

Hello, I am wondering if anyone knows any correlations or equations that can give me the temperature of a wire due to power losses. I understand how to calculate the power loss in the wire, based on wire resistance and current (P=I^2*R) but how do I turn this into a heat transfer problem and...

Homework Statement A 7.40 cm diameter coil consists of 15 turns of circular copper wire 2.3 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 7.29×10^−3 T/s . Determine the current in the loop. Express your answer using two significant...

Can electrical currents in a wire affect each other? Imagine racecars and how they affect each other in a race for this. Reply in simple english please.

Hi, I am currently working on a personal project, I am trying to build a lifter (ionocraft) According to the book my HV PSU. will give around 25 - 30 kV. I already got all the parts for the circuit, I just have a couple of questions about wires: how do I choose a wire? should I use...

In each of the 10 cases below, 2 - 4 Very long straight wires are parallel to each other. Rank the strength of the total magnetic force on each of the labeled wires. So each case has 2-4 wires with varying currents and distances between; I have to calculate the magnetic force and then rank...

Homework Statement Two long parallel wires are separated by .006 m. The current in one of the wires is twice the other current. If the magnitude of the force on a 3m length of one of the wires is equal to 8μN, what is the greater of the two currents? The answer: .40 A Homework Equations...

Homework Statement Two long parallel wires each carry a current of 5.0A directed to the east. The two wires are separated by 8c.m. What is the magnitude of the magnetic field at the point that is 5.0 cm from each of the wires.Homework Equations B= \frac{μI}{2∏R}The Attempt at a Solution I know...

Asking in most general shape, why do signals from upper Ghz and above don't seem to travel in wires? Radio frequency waves can propagate in wires - you can have a signal like that being induced from the wave interacting with the wire, being generated, measured directly, and so on. But...

I was just wondering, that if we have two electron beams passing by each other, would there be any magnetic interaction between them ? Just like, electrons in current carrying wires. I asked the similar question earlier but with the change that one of them was a current carrying wire, whereas...

Two questions here. From real-world problems, I was hoping someone smarter than me could explain the physics behind some issues I was told about. It's been a long time since I looked at an engineering or physics book, so please bear with me. 1) For a 3-phase motor, I was told that someone...

Hello first post here. These problems aren't for a specific course just working through an old textbook specifically Vibrations and Waves by A.P. French. I hope it's alright that I include two problems in one thread. Homework Statement Q 3-7) A wire of unstretched length L0 is extended by...

Hey I was wondering if anyone could help me, I have a single phase motor with a single capacitor,on a woodworking saw, which the switch broke, it was sprung loaded, so I guess a start run switch. It's for a friend and he took the switch off without marking the terminals, I can't find another...

Homework Statement Three parallel wires carry a current of I 1 = 3 A, I 2 = 2 A, and I 3 = 1 A, respectively. They are arranged as shown. If r = 2m and L=5m,what is the magnitude of the net force on the bottom wire? <------------------------- I1 r -------------------------->I2 2r...

I am guessing that it is easier to produce that way, and gives it more flexibilty. Are these the reasons for wires being mafe of many thin threads, and are there other reasons? Does it allow for better heat dissipation?

The wires are allowed to reach 4.2K but preferably slowly. They will be run alongside a helium transfer line. Before the helium runs the wires will be at 78K. I thought there would be products for this, but looking around the best I've found is insulation good down to 172 K...

Homework Statement Two long parallel wires are a center-to-center distance of 4.60 cm apart and carry equal anti-parallel currents of 4.40 A. Find the magnetic field intensity at the point P which is equidistant from the wires. (R = 4.00 cm). Homework Equations magnetic field for a...

Two long current-carrying wires cross at an angle of 21° ("theta" is half of this) as shown in the figure above. The magnitude of the current is the same in each wire, I=400 A. A wood mouse is running along the dashed line midway between the wires towards the point where the wires cross...

Does anyone know if I run 12 volts dc at 1 amp power for a distance of 250 feet and one wire is 12 gauge used for positive and other negative wire is 20 gauge will the smaller ground wire affect what the positive wire can carry? John

Four Wires form corners of a square. Force exerted by 3 of them on 1. Concept help! Homework Statement side length "a"= 5.5 cm current through wires "I" = 1.6A "L" of lower right wire= 1 cm upper and lower left currents are out of the page upper and lower right currents are into the...

I have read about how magnetism arises from electric interactions and relativity. But in that respect i don't see how perpendicular wires can exert magnetic forces on each other. The movement of the charges is perpendicular so length contraction does not occurr in the direction of the current...

Homework Statement So basically there are two parallel wires the wire on the left has an increasing current going north. What would be the direction of the current in the wire left of it? Homework Equations Right Hand Rules The Attempt at a Solution So I'm really not...

Could one burn aluminium wires by striking up an electric arc between them and then feeding them towards each other as they are consumed (like an arc light)? I assume the aluminium oxide would be burnt off as a vapour by the high temperature of the electric arc and thus would not inhibit the...

Two long, parallel wires are separated by a distance of 1.0 m. The current in each wire is 1.0 A. Which of the following is the magnitude of the force on 1.0 m length of each wire? A. 2π×107 N B. 2×107 N C. 2π×10–7 N D. 2×10–7 N Homework Equations Force on wire= B field density * Length...

I was wondering what the difference in current is if there is one when you have a bundle of copper wire passing through alternating magnetic fields verses a solid copper rod of the same diameter. Will the rod have more current because there is more copper? Would it have less because more copper...

This may be an obvious question but I have no idea: How can anyone link current-carrying wires (solenoids) and its formulae, to magnets?! All I've researched so far points out that magnets have their own stable magnetic field, attributed to the alignment of spins of the electrons of the atoms...

Can direct current running in opposite directions in parallel wires increase the apparent resistance of a system? This is a real life problem that I’ve noticed on some electroforming equipment we relocated. Prior to the move the wires were separate. Now they are located in a conduit...

Homework Statement Two long fixed parallel wires, A and B, are 10cm apart in air and carry 40 A and 20 A, respectively, in opposite directions. Determine the resultant field (a) on a line midway between the wires parallel to them and (b) on a line 8.0 cm from wire A and 18cm from wire B (c)...

Homework Statement Consider 2 parallel wires with currents running down them in the same direction. The first is fixed in place unable to move. The second is allowed to move. They exert an attractive magnetic force on one another, and the second wire moves towards the first. The second moves...