Wires Definition and 543 Threads

Homework Statement A telegraph consisted of 2 long straight wires carrying currents equal in magnitude but oppositely directed. Each was suspended by a pair of light-weight and inelastic threads that were about 6cm long. When current flowed through the wires, the magnetic force exerted between...

Homework Statement 11. Two parallel conductors, 1.0 cm apart, each carry 10 A of current in opposite directions. What is the magnetic field strength at the midpoint between these wires?Homework Equations B = μI/ 2πrThe Attempt at a Solution I know that the magnetic field is doubled because...

I can do circuit problems, but conceptually I cannot figure out what is going on from a basic physics perspective, with respect to the following: Say you have a circuit with a battery (emf = V) and a resistor (resistance = R). Then, electrons on one side of the resistor are in a constant...

1. Homework Statement [/b] In the figure, two parallel wires carry a current I in opposite directions. A rectangular loop is midway between the wires. The current I is decreasing. The induced current through the resistor R is: A: Zero B: from b to a C: from a to b Homework Equations...

Homework Statement 2 1.2m nonconducting wires meet at a right angle. One segment carries +2.5*10-6 C of charge distributed uniformly along its length, and the other carries -2.5*10-6 C distributed uniformly along it. Find the magnitude and direction of the electric field these wires produce at...

Recently I've been interested in delving in deeper on the applications of magnetic wires. From this video, I was curious as to whether these wires (more specifically their enamel coating) were permanent magnets? Electricity and Magnetism Simple Electric Motor and if I use that...

The question is fairly simple but I am afraid the answer will not. I have seen many information about magnetic force between infinite parallel wires but almost nothing about finite ones. So, let's have two finite parallel wires, each one 50cm length, in 10cm distance, both have the same...

Homework Statement Two wires A and B are connected in series at 0oC and resistance of B is 3.5 times that of A. The resistance temperature coefficient of A is 0.04% and that of the combination is 0.1%. Find the resistance temperature coefficient of B. Homework Equations Rt=R0(1+α0t)...

Capacitor problem -- Calculate the heat in connecting wires Homework Statement A 5.0\muF capacitor is charged to 12 V . The positive plate of this capacitor is now connected to the negative terminal of a 12 V battery and vice versa. Calculate the heat developed in the connecting wires...

Here is an excerpt from my textbook: "Ordinarily, this charge would simultaneously generate so large an electric force as to swamp the magnetic one. But if we arrange to keep the wire neutral, by embedding in it equal amount of opposite charge at rest, the electric field cancels out, leaving...

This was pretty amazing. We have an ‘invisible fence’ for the dogs. I installed it myself years ago. It’s just a single strand of wire that wraps around our entire yard that must transmit some kind of signal to the dog’s collar so when they get close to it, the collar starts beeping. If the dog...

Homework Statement So four wires are arranged in a square and all carry the same current "I" They are all the same distance apart. The two on the left are coming out towards you "O" and the two on the right go away from you "X" I knew I would need kI^{2} divided by distance, but I"m not...

Homework Statement https://www.smartphysics.com/Content/smartPhysics/Media/Images/EM/14/h14_threewires.png Three infinite straight wires are fixed in place and aligned parallel to the z-axis as shown. The wire at (x,y) = (-10 cm, 0) carries current I1 = 2.9 A in the negative z-direction...

My question is in the attached image. Before going right at it, I thought it would be best to clarify a few details. Ohm's Law only shows that current and potential are linearly related, correct? So R is constant in the case of a material that follows Ohm's Law (metal conductors for the most...

Homework Statement Two parallel infinite wires lay parallel to the z-axis in the xz-plane. One located at x=d has charge distribution λ and one located at x=-d has charge distribution -λ. Homework Equations a) Find the potential V(x,y,z) using the origin as a reference b)Show that...

Homework Statement Homework Equations All included above The Attempt at a Solution Well, my solution is there in the box at the bottom. I solved for each of the wire sections individually, two half-infinite straight wires and one quarter-wire. My answer at the bottom there is...

Homework Statement A household appliance consumes 1800W of power from a 120V wall plug. Calculate the power consumed due to a wire of length L = 22.0m and diameter D1 = 1.628mm (with resistivity p = 1.680 x 10-8Ωm). If a house spends $1400 per year in electricity bills, how much money can be...

Hi everyone! This is my first post here, i hope to not make a fool of myself... Homework Statement I was asked to find the tension forces in the 4 wires by which a cabinet is suspended from the ceiling. The cabinet's centre of gravity does not coincide with its centroid, but is located...

Homework Statement Three straight current carrying wires for each a current I as shown below. They are in the corners of a square that has sides a. Specify the resulting magnetic field at point P in the lower right corner, give both size and direction of the field. Homework Equations...

Homework Statement The rod of length l and mass m_0 is hinged on two same wires (Fig. 3 on second page - example ,,4. Zvučící dráty" - http://fyzikalniolympiada.cz/archiv/55/fo55a1_z.pdf). With this load, each of the wires gives basic tone height c in natural tuning, f_c = 264 Hz. A) Move the...

Homework Statement A coaxial cable with inner radius a and outer radius b lies on the z-axis (such that the cable's axis merges with the z-axis). its length (along z-axis) is L. at z=-L there are voltage sources that are distributed uniformly connecting the inner wire to the outer one. at...

Say I have three parallel wires facing north east that run through a square. The first wire goes through the top right edge. The next wire goes through the top left edge and the last wire goes through the bottom left edge. There is a point on the last edge of the square. When calculating...

I want to know how to calculate the force , I know the formula and such but its just that I'm not sure about the Length part , I mean if Wire1 is longer than Wire2 ,then should I take the common length between them , or just substitue with the total length ? , should F1on2=B2I(delta)l or B2I1L1

If electrons flow on the surface of a wire, why isn't copper coated aluminum wire used in electrical applications instead of solid copper wire? It would be more cost effective

Homework Statement In the figure (Figure 1) the top wire is 1.1−mm -diameter copper wire and is suspended in air due to the two magnetic forces from the bottom two wires. The current flow through the two bottom wires is 87A in each. Find the Current through the Copper wire. Homework...

Hello PF! I've been having a hard time with this exercise, I did what I could but I highly doubt I got it right since I missed a few lessons :/. Anyway, here it is: A transmission line consists of two parallel conducting wires of length l and radius a separated by a distance b (center to...

Currently using resources like: http://www.matterandinteractions.org/Content/Articles/circuit.pdf http://www.phy-astr.gsu.edu/cymbalyuk/Lecture16.pdf I don't seem to understand why the surface charge densities shown in the pictures are stable. I understand that the densities shown create...

Our Physics teacher used to tell us that in an ac circuit the current and hence the flow of electrons is reversed every half cycle as the polarity of the supply changes every half cycle. However I am still puzzled about the following. In the UK, the live is the wire that delivers electrical...

I don't have extensive knowledge of electrical engineering so I need a little help. I want to make an electrical connection, but with one small hurdle. One wire must be stationary, and the other must be allowed to rotate. How would you guys go about solving this problem? My first thought...

Hello Experts I have a question regarding high amperage going through strands of wires. For example, when hundreds of amperes surge through a thick cable of wire containing multiple copper wires, why is it that the current did not choose to go through just 1 of these strands of thinner...

In case of a transmission line consisting of two wires in parallel (aka Balanced line) the characteristic impedance Z0 is given by this equation: where l is half the distance between the wire centres, R is the wire radius and \mu, \epsilon are respectively the permeability and permittivity of...

Suppose you have two poles separated by the distance $w$, the first of height $h_1$ and the second of $h_2$, where $0<h_1<h_2$. You wish to attach two wires to the ground in between the poles, one to the top of each pole, such that the angle subtended by the two wires is a maximum. What portion...

Hi all! I am running an experiment in which I have rigged up a circuit to anodise aluminium foil. Running it with a constant voltage of ~40V I have found that rusty wires, poor connections (I am using alligator clips) and even using stackable banana plugs causes erratic (and high) currents...

These are 2 straight wires parallel for 3 inches. Specifically a 6AWG and 12AWG separated approximately 2 inches. A surge current enters on the 6AWG which has a rising edge of 2500A/us. This is for a surge device ... I have been working in plain old RF for too long to be certain that I using...

Homework Statement My car has rear defrosters that are made of 13 wires embedded into the rear window. They can melt a thin layer of ice, roughly 2.25*10^-2 kg worth, in two minutes. These wires are all in parallel and are connected to the 12V battery of my car. Each is about 1.25m long and...

1. Multiple choice problem, the prompt is the following: Two wires carry currents is opposite directions, as shown below. The wires are separated by a distance of 0.02 meter, and points P and Q are located 0.01 meter above and below the bottom wire. Compare the Magnetic field strength at...

Homework Statement I was given this question on a "practice final" and I have no idea how to approach it whatsoever...any help (particularly if you could walk me through it...physics isn't my forte...!) would be greatly appreciated! "Two long straight wires are oriented perpendicular to...

Wire A and B, which have the same cross-sectional area are connected in series. There is a p.d. V across the whole wire. Suppose the two wires obey Ohm's law J = σE Also, A and B have different conductivity. Therefore electric field of A is different from B. There should be a layer of...

If you place a wire with a running current in a magnetic field, the magnetic field will exert a force on the wire. So, if you place two wires parallel to each other, the current on each will produce a magnetic field, which in turn will attract or repulse the other wire depending on the direction...

Homework Statement Problem statement along with relevant diagram attached with picture below.Homework Equations The Biot-Savart Law for a long current carrying wire. B = (μ)(I)/2(pi)(d) Where d is the perpendicular distance between the wire and the point at which the field is being calculated...

We all know that there is a force between them. But I wonder... if electrons in both wires are moving with the same speed the relative velocity between the electrons in wire A and B equals zero - but then there would be no magnetic field and no force. Could you help me with this?

does ac current always flows from hot to neutral wire.if so where is the end of the neutral wire?

Homework Statement In the figure, two wires are hanging parallel to one another. Each wire hangs 7 degrees from the vertical on 5 cm long cords. If the wires weigh 35 grams per meter, how much current do they carry? http://www.usi.edu/science/physics/pickett/206/15p2f1.jpg Also, the current...

Homework Statement Three identical wires Lo, diameter d, are arranged like a Y letter (please see attachment) Each end of the wires is secured to a wall. Initial tension is approximately zero. If the wires are cooled ΔT, find the distance the knot moves to the right and the final tension in...

1. The figure shows an end view of two long, parallel wires perpendicular to the xy-plane, each carrying a current I=5.00A but in opposite directions. What is the magnitude and direction of the B-field at point P that is produced by the current in the two wires? 2. B=(μo/4pi) integral...

Homework Statement Four very long, current-carrying wires in the same plane intersect to form a square with side lengths of 31.0 cm, as shown in the figure (Figure 1) . The currents running through the wires are 8.0 A, 20.0 A, 10.0 A, and I. Find the magnitude of the current that will make...

Homework Statement A resistor is made out of a low wire having a length L. Each end of the wire is attached to a terminal of a battery having a constant voltage Vo. A current I flows through the wire. If the wire were cut in half, making two wires of length L/2, and both wires were attached to...

Homework Statement We have wires like in the picture and we want to know the value of magnetic field as function of x: NOTE: We want to know the magnetic field at point P ( P is on +x axis ) ( Which is totally arbitary!) The picture is there for just to give the idea. R is the distance from...

Homework Statement Find cord tension and force on the hinge on this beam given the following: Picture of the equation (in attachments) beam is 10 kg beam is 8.0m longHomework Equations [T=0 [F=0 [h2]The Attempt at a Solution[/h2] Finding the Torque on the wire... I attached my FBD I drew...

Homework Statement Wire Ia and wire Ib are infinitely long and perpendicular to each other, separated by distance d. Wire a has current Ia and the direction of current is into the page. Wire b has current Ib and the direction of current is straight up. What is the force per length of Ia on Ib...