Conductor Definition and 820 Threads

Homework Statement Problem 1c from here: http://web.phys.ntnu.no/~ingves/Teaching/TFY4240/Exam/Exam_tfy4240_Dec_2013.pdfHomework Equations Maxwell's equations The Attempt at a Solution According to the solutions, the electric field is ZERO everywhere because it's "magnetostatics" and because...

I've been stuck on what I would of thought was a simple/common question but I can't seem to find an answer anywhere. I'm confused as to how a DC current propagates along a conductor (wire) in terms of it's E/H field. I understand that it is these fields that cause the propagation of current...

I need to figure out if my companies pulling equipment can handle a 795 drake conductor (about 1 lb/ft) double bundled (times 2). The pulling equipment has a safe working load of 4000 lbs. We are pulling it across 16 spans with a average span of 674 feet. the towers are 115' tall. Max sag...

Hi! Just curious... Does a break in the continuity of a conductor's volume affect its magnetic field, resistance, etc?

Would Electric Field on the surface of a conductor point inwardly due to the excess of negative charges on the surface? Lastly, I cannot seem to conceptualize why the E field inside the conductor is zero? Is it due to the protons that are in opposition to the electron's efields? Thanks...

Neutral conductor. Where can I find information about strange installations sharing the neutral conductor between two different installations ? Best Regards

Taken from wikipedia, "If several turns of the wire are made, this becomes where N is the number of turns..." when speaking in terms of flux linkage and coils of a wire. However, in terms of a straight conductor (e.g. transmission lines), flux linkage for a meter long straight conductor has...

Homework Statement I never quite understood the principles of earthing, but I think that the general idea is that if you have an object with excess charge (whether positive or negative), then connecting it to the Earth with a conductor will mean that either the excess electrons flow to the...

Homework Statement I understand why, using Gauss's law, the net charge within a conductor should be zero at any point. However, when I try making a Gaussian surface that is so small so as to enclose a single proton, I cannot see why the enclosed charge should be zero for that situation as...

If we consider a current carrying conductor, every instant an electron enters the conductor, another electron will be leaving the conductor. Thus, the current carrying conductor will not be charged (i.e, it would not have any net positive or negative charge). Remember dipole has zero net charge...

I have a small conductive, non-magnetic particle in which I will induce a fairly strong electromagnetic field into using a flow of current. I will then disconnect the power source that makes the particle electromagnetic. How long will it take the magnetic effect of the particle to diminish...

Homework Statement A spherical conductor of radius ##a## carries a charge q and also there is a jelly of constant charge ##rho## per unit volume extending from radius ##a## out to radius ##b##. I'm looking to see if I got the correct set up for the electric field of this spherical conductor for...

1. Problem Statement: The figure shows a cross-section view of a very long cylindrical cable. There is an outer tube made of copper, inner radius 2R, outer radius 4R. The inner copper wire has radius R and is concentric with the tube. The inner wire has charge density –2λ (per unit length)...

What determines the current capacity of a conductor? How can I know the maximum current, any conductor can carry safely, over shot or long durations of time. Example: A conductor that is 1m long, 0.00025m wide, and about 0.003m thick is used to deliver power continuously in a system. How much...

Homework Statement A conductor carrying current ‘I’ is in the form of a semicircle AB of radius ‘R’ and lying in the x-y plane with its centre at origin as shown in the figure. Find the magnitude of ∫B.dl for the circle 3x2 +3z2 =R2 in the x-z plane due to curve AB. Ans (1-√3/2)μ0I Homework...

I do not really understand the big picture of gauss law. For what I know a conductor is a material where electrons can move freely, but I am reading my book and they show pictures where the protons are all right below the surface. My other question would be how can you describe the inside of a...

Suppose we apply a uniform field to an infinite conducting slab (i.e. like an infinite parallel plate capacitor, but the interior is included as part of the conductor). What is the resulting field? The simple answer is that a surface charge develops on the boundary planes of the conductor so as...

Homework Statement A metal sphere of radius ##R## carries a total charge ##Q##. What is the force of repulsion between the "northern" hemisphere and the "southern" hemisphere?Homework Equations The force per unit area on the surface of a conductor: \vec{f} = \frac{1}{2\epsilon_0}\sigma^2\hat{n}...

My question is can plasma be used to conduct electricity as efficiently as a solid conductor? I know stability is an issue , but can it be overcome.

Hi guys, I was playing around with conductor configurations and observed this phenomenon. Mind you these are for the High voltage transmission (138 kV) lines that span kms. So apparently, the orientation of the conductor relative to North will change the ampacity of the transmission line. Can...

Definition/Summary A material is a conductor if it contains charges (eg electrons ions or "holes") which are free to move. In equilibrium, the charge inside a conductor is zero, and the density of charge at the surface is greater where the radius of curvature is less (and in the direction...

1)If a negatively charge plastic rod (q=-20 e) is kept near the sphere.( which having net charge is zero.) Then how much negatively charge is repelled at the other end by this plastic rod on sphere. 2) if earthing is made to the sphere (at the other end), then all the charge which is repelled...

I am not sure if I should start a new thread or revive an old thread this because it is the same topic. Location of tests: Scandinavia I simply want to know why and how a current carrying conductor parallel to Earth surface moves perpendicularly to the current flow and parallel...

i search all over the web but i cannot find the definition. Although I find all the literature saying that metal have valence band and conduction band overlapped, (and I cannot find a metal example with valence band and conduction band not being overlapped), I wonder if there is a...

Homework Statement A charged conducting sphere with radius 30cm is having a charge of -50nC. A proton is released from rest at R= 10m. Calculate the velocity of the proton when it reaches the surface of the conductor. What happens to the velocity of the proton when the charge on the sphere...

I have two sphere. 1) one with free electron, if i connected sphere with the Earth by conducting wire all the free electron will flow to the earth. 2) one with positive charge, if i connected sphere with the Earth by conducting wire then the electron from the Earth will flow to the sphere...

If I send a pulse down a conducting wire, does the pulse emit an electric field?

Hello, I know that the movement of a charged particle in space or a fluid caused by an electric field is accelerated(a = F / m) by the Coulomb force(Fc = k q1 q2 / d^2). And the Kinetic Energy of the particle is calculated through this equation ΔKE = q ΔV. But does an electron accelerate in a...

Hello I want to know surface charge density of the conductor in all part of that is same or not? for example in this shape ? if isn't why and how the surface charge density spread? Thanks

According to wikipedia, "The moving magnet and conductor problem", I stopped at the equation shown in the attachment. It said that the curl of the E` ( electric field in the frame of the conductor) is equal to minus of the dot product of the velocity of the conductor and the del multiplied by...

I have read that in a charged conductor, all the charge is located at the surface of the conductor and the Electric Field inside the conductor is zero. Suppose we have a conductive sphere with charge Q = -4e. Where exactly in the sphere are these 4 electrons? I know that they are "on the...

To be concrete, consider two parallel conducting plates, one positively charged and the other negatively charged. Why doesn't the electric field between the two plates pull the charges off the surface of the two plates?

As we know there is no charge inside the conductor.(Consider the solid conductor...) All the charge will distributed on the outer surface of the conductor. There is no charge inside the conductor My question is when we applied potential difference across this conductor then current will flow...

Homework Statement An electric current I flows in a straight conductor of length L. Use the law of Biot-Savart to find the magnetic field at a point lying on an axis going through the centre of the conductor and perpendicular to the conductor. Homework Equations Law of Biot-Savart...

Homework Statement Let L be the length of the conductor having uniform cross-section area A and density, let I be the current passing through the conductor. How the total number of positive charge carriers in the conductor of length L is (nAL)?

Homework Statement Doing my homework I came across the question: why it would be better to have styrofoam on the inside of the house And why it could be better to have it on the outsideThe answer is The steady state will be the same for both but inside: warm and cold quickly Outside...

A current flow occurs when there is movement of electron in a conductor. But in a electrolyte its the ions that move and we still say there is current flow. Are the electron flow in a conductor and ion flow in a electrolyte is the same?

Homework Statement Infinite straight conductor, parallel with z axis, of radius R1 with a cylindrical cavity of radius R2. The axis of the cavity passes through the point <0,b,0>. A current I flows through the conductor. The current density is homogenous inside the cundoctor. Find the...

(Wasn't sure on the right section for plasma physics, I apologise if this is wrong).I'm reading up right now on a plasma surrounded by a tokamak wall, and the assumption of ideal magnetohydrodynamics - which assumes very little internal electrical resistivity and so the plasma can be assumed as...

For an imperfect conductor, when there is current, an electric field is set up inside the wire along the direction of the current flow, and is parallel to the wire. If this is true, then what I don't understand is boundary condition tells me the tangential E-field is always continuous, if...

What will happen if I move in the direction of drift of the electrons in a current carrying conductor? What would happen if my speeds are equal to the drift velocity and in a second case close to the speed of light

Homework Statement GMR_{hollow cylinder}=Re^{-Kμ} where K=\frac{AR^4-R^2r^2+Br^4+r^4ln(R/r)}{(R^2-r^2)^2}, where R is the outer radius and r is the inner radius, and mu is the relative permeability. We are to determine the numerical values of A and B. I am stumped on how to begin attempting...

i have a TT earthing system and to decrease the resistance of the system I'm connecting the rods in parallel. i have the earthing conductor connected but as a mean of security, I'm thinking of connecting a second earthing conductor from the rod to the main Earth bar. Does this cause a any...

I know that charges experience a force when they are moving with respect to a magnetic field , but in case of conductor how is the force on the freely flowing electrons transferred to the structure of the conductor?

Hello as you see this example and solution if we assume the R of conductor sphere is 5m and check voltage in different z we obtain(for example z=1m and z=2) and as we know in conductor we doesn't have voltage differences so this equation should be the same C=0 but voltage...

As we know due to skin depth effect the Alternating Current flows at a depth from the conductor surface (which means there is no voltage on the surface of the conductor, it is only at a depth from the surface). Then how is it possible for voltage to get appeared across some other conductor...

Hello everyone! Homework Statement A charge, +q, is placed above an infinite conducting slab located at z<=0, at (0,0,d). Find the potential everywhere in space, without using the image-charge method. Homework Equations Laplace's equation(and its solution in spherical coordinates). (CGS units...

Hi, Does anybody know a material which is a good thermal conductor and an insulator at the same time (at temperatures around 4 K) and is "easy" to fabricate? For e.g. sapphire fulfils the first two requirements, but is extrmely hard.

I know there is no net flux in a conductor but do they go through the conductor? Say you have a positive q charge inside a hollow sphere that's charged pos q as well. Well that charge from the inner shell should keep penetrating space until it hits a negative charge which implies it goes...

What cause potential difference in the conductor? I mean why the changing magnetic flux induce EMF? I understand the basics but I can't understand it. What I know: there is free electrons on the surface of a copper conductor. Electron have electric field vector and magnetic field vector and...