Conductor Definition and 820 Threads

why can't there be an electric field in a conductor?

Please tell me if by gauss law total electric field inide a solid conductor is zero... how can uniform charge density exists... Will there be any electric field inside a charged conductor ? or will it be always zero.

by definition, a charge cannot move inside an insulator and by a similar definition, a charge can move inside a conductor. so, I don't understand how do we could charge an insulator, the charge cannot move, or there is something that i missed?

Homework Statement My problem is from book Electromagnetic with applications by Kraus & fleisch.problem no. 2-5-2. In the problem "two conductor" line is given & magnitude of electric field due to this on a co ordinate(43cm,32cm) is also given=450v/m. Radius of conductor, Position of center of...

Hi I am currently working at a company for a work placement who make underwater mateable electrical connectors. The company recently have been asked to make a connector which can withstand high temperatures. Basically, the conductor parts of the connector will be in hot oil which will have a...

1.Two plates placed a distance "D" apart. One charged +Q, the other -Q. An uncharged slab of metal is placed between the plates. 2. Does this slab change the electric field outside or between the plates (but outside the slab)? Do forces exerted on particle sitting between the plates (but...

We know that if an electron enters a region of magnetic field which is perpendicular to the direction of its velocity, the electron will start moving in a circular path. But, now instead of a single electron we place a circular condutor in the region of the field, and somehow manage to give an...

Are the electrons in conductor with current repel? When they move in conductor with current on closed circular loop, are they repelling? http://img135.imageshack.us/img135/260/electronrepelgt9.gif"

Homework Statement When a positively charged conductor touches a neutral conductor, the neutral conductor will (A) Gain protons (B) Gain electrons (C) Lose protons (D) Lose electrons (E) Stay neutral Homework Equations The Attempt at a Solution You know how when two different charged...

Homework Statement I am conceptualizing for a high school physics project and what I am currently trying to do is setup two ceramic magnets with opposite poles facing each other, but with a space in between. Next I have a wire running in between that is connected to a 1.5V power supply...

Are the electrons moving like this in conductor with current? I mean are they jumping from atom to atom (roughly said)? Why they are jumping from outer orbital to outer orbital when all outer orbitals in all of the atoms in conductor have same energy? Look the picture. Imagine that, the electron...

Answer please. Thank you.

What make the electrons to move in conductor with (direct) current? Is the magnetic field exciting the electrons or what? Please if you know explain deeply.

plastic conductor? I just tooned into the end of a segment on "daily planet" about this guy who found out a way to create a plastic conductor. He says it conducts electricity as well as a metal wire and is very light weight (and will literally change the world of electronics). Anyone have...

Ok, I reformed my question, and I will be very happy if you answer me. I know that the electrons have magnetic field. So if the electrons are moving through a conductor (in direct current) than logically the magnetic field will move also. So there will be also self-induction. Can you give me...

Why is it that BOTH electric AND magnetic fields are zero inside the conductor. My book says that the H-field is zero due to the fact that the E-field is zero but doesn't give any detailed explanation.

I have a quick question. I recently did an E&M problem in which I was given a cylindrical conducting wire of radius a, in which someone bores an off-center cylindrical cavity of radius b (the center of the smaller circle is offset from the center of the wire by distance d). I'm asked to find...

Does anyone know how to find the actual charge dustribution on a conductor? More like the alignment of all the charges on a conductor? I know that the electric field should be zero everywhere on the conductor and that on pointy edges there is more charge buildup, but I have no idea how to find...

1) A thin, horizontal 0.10m x 0.10m copper plate is charged with 1.0x10^10 electrons. If the electrons are uniformly distributed on the surface, what are the strength and direction of the electric field 0.1mm below the centre of the bottom surface of the plate? (Note: copper is a conductor, so...

Hi, I hope this is advanced enough to warrant being in this section: I'm supposed to use the Gauss theorem (and presumably his law) to show: 1)The charge on a conductor is on the surface. 2)A closed hollow conductor shields its interior from fields due to charges outside, but doesn't...

if there is not a uniform distribution of charge in the middle how is it possible that there's a uniform field outside. I know why it's true according to gauss's law but it doesn't make sense to me. if there's some positive charge near the interior wall somewhere then there will be an...

Homework Statement Wangsness exercise 24-12 A plane wave travels in the postiive z direction in a conductor with real conductivity. a) Find the instantaeous and time average power loss per unit volume due to resisitive heating for any z b) Find the total power loss per unit area...

Homework Statement Two insulating spheres having radii 0.300 cm and 0.500 cm, masses 0.100 kg and 0.700 kg, and charges -2.000 micro-C and 3.00 micro-C are released from rest when their centers are separated by 1.00 m. (a) How fast will each be moving when they collide? (Hint: Consider...

Hi guys, I was wondering if someone could help explain something to me. I am just starting out learning about Ampere's law. I am looking at this example in the book and I don't get it. They have a cylindrical conductor with Radius R and current I. The current is uniformly distributed over the...

say there is an infinite grounded conducting plane and a point charge of charge q is above it. the induced charge on the plane is -q and i know how to find this using the method of images to find the potential and then finding and integrating the charge density, but my text says that it should...

i have a doubt as to why we get a magnetic field around a current carrying conductor.

I need to prove conservatino of energy in a conductor of real condictivity \sigma. I need opinion on how to proceed. My best guess was to use Poynting's theorem in differential form, which says that the rate at which work is done per unit time per unit volume on the charges in the metal by the...

Hi, When we calculate electric field due to a charged spherical conductor at a point outside the conductor, by Gauss's law, it is equal to the electric field due to a point charge at the center of sphere, with net charge on the sphere. We can also calculate this electric field strength...

I know an argument that i don´t like. It say´s: If there were electric field inside a conductor in electrostaic equilibrium, it would exert force on the charges and move them. But this argument implies that there are infinite charges inside the conductor. This is not very plausible, if...

In the context of properties of conductor & 1st Uniqueness theorem, Griffiths proves that field inside a cavity( empty of charge) within a conductor is 0. Is the result same if we place a +q & a -q (so that Q(enc)=0) suspended in air inside the cavity?

Question asks: Two spherical conductors of radius 0.01m are placed with their centres 0.1m apart. Calculate the capacitance (C) of this system. I can't do it like a parallel plate capacitor can i? and its not a traditional spherical capacitor is it? So I'm going to have to do it the long...

There is something I don't quite understand about conductors with excess charge. I understand the rationale that says that the electrons will all be on the surface, since they are repelled by the inner electrons orbitting the atoms, and by other excess electrons...but why do they not fly off of...

I was told that at electrostatic equilibrium, the electric field inside a conductor will be ZERO, so that the charges will not move any more. but why, I argue that, even when the electric field is not zero everywhere inside the conductor, there is still a chance for the charges to be...

While taking photographs in Death Valley on a day when the temperature is 51.0°C, Bill Hiker finds that a certain voltage applied to a copper wire produces a current of 1.000 A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current does he register there if...

Hello guys, well its that time of the week when I am busy working on my homework again! One of this weeks questions is that there are 2 hollow concentric conducting spheres which hold charges Q1 (inner shell, radius R1), and Q2 (outer shell, Radius R2 ) 1) Find the potential difference...

The electric field in a conductor goes to zero...or so my book says (which I'm inclined to believe). But I don't really understand why. I understand the polarization of the conductor in question, but how does this negate the electric field in the conductor? The book says something about...

Hi, I have the following question: An uncharged wooden stick is balance on a pivot so that it can rotate freely. If a charged rod is brought close to one end of the stick, the stick will be... Attracted by the charged rod is the answer. This has got me confused for a while. Here is my...

Hey everyone, I have failed to show that the magnetic flux outside a cylindrical conductor is zero. The problem goes like this: a coaxial cable consists of a solid inner cylindrical conductor of radius a and an outer cylindrical conductor of inner and outer radius b and c. Distributed...

I was wondering if someone could give me a link to a site that will discuss the left hand and right hand rule for a straight conductor and a helix.

Figure 29-62 shows a cross section across a diameter of a long cylindrical conductor of radius a = 2.00 cm carrying uniform current 154 A. What is the magnitude of the current's magnetic field at the following radial distances? http://www.webassign.net/hrw/hrw7_29-62.gif I figured out parts...

How does one prove that the force between two conductor plates is F=q^2/2eA, where e=epsilon. If I use F=qE. Where the electric field is generated by one of the conducting plates: E=q/eA, then F=q^2/eA. I think what the answer assumes is that the E-field is from a uniform plate...

#1. We have a hollow metal spherical shell with charge -q and with radius rb #2. We have a soild metal sphere supported by an insulating stand with charge +q and radius rb #3. The solid metal sphere is located in the center of the hollow metal spherical shell (aka. #2 is in #1) The question...

can a plastic conduct? why or why not? help..

Field inside conductor in electrostatic is zero. So they say...cuz the free-particle will move due to eny Electricfield present until they all stablized to the surface of the conductor to cancel the Electricfield present inside, thereby making the net field inside zero. After understading...

I've been studying gauss' laws etc. at uni and I was thinking about charged conductors. When a conductor is charged the charge distributes itself in such a way that the electric field inside the conductor is zero, and hence if there is a cavity inside the conductor, the net force on a charged...

Hello everyone. I'm having troubles getting the last part of this question. An isolated conductor of arbitreary shape has a net charge of +10x10^-6C. Inside the conductor is a cavity within which is a point charge q = +3.0x10^-6C. What is the charge (a) on the cavity wall and (b) on the...

what is the physical explanation of the fact that the electric field is zero inside a conductor? :confused:

Consider a spherical conducting shell where all the charges reside on the surface. Using Gauss's Law, it can be found that the electric field inside the shell is zero. But why is the electric potential a constant? More over, why is the potential same as the potential on the surface of the shell...

Hello, I have to start working on my physics extended essay and I got the idea of measuring the speed of an electron in a conductor. For instance, I could take a piece of wire (r) made from some conductor and I would like to find out the net speed of the electrons in the wire once I create an...

Here is a problem that I don't quite understand. P: Two hikers are reading a compass under an overhead transmission line that is 5.0 meters above the ground and carries a current of 400 Amps in a direction from south to north. a. Find the magnitude and direction of the magnetic field at...