Conductor Definition and 790 Threads

[SOLVED] Field of long cylindrical shell conductor Homework Statement Shown above is the cross-section of a long cylindrical shell conductor of inner radius a=4.00 cm and outer radius b=7.00 cm which carries a current into the page. The current density J (current/area) is uniform across the...

the field inside a conductor is zero therefore A. the potential inside the conductor is zero B. the potential cannot be zero C. The potential inside the conductor is the same as the potential just outside the conductor (on the surface) D. the potential inside the conductor cannot be defined...

Homework Statement Which of the following situations would result in a magnetic force on the wire that points due north? Check all that apply. Current in the wire flows straight down; the magnetic field points due west. Current in the wire flows straight up; the magnetic field points due...

We know that if current is flowing in the direction of z-axis (verical), magnetic field is formed in a plance perpendicular to that line i.e., in the XY plane. That is if you keep a compass in the XY plane it will experience a force as per the rule. But what will happen to a compass that is...

Homework Statement I have a slab of conductor on the ground with thickness, a, and it extends in all directions infinitely. Then I have a slab of insulator above the conductor of thickness, a, and it also extends infinitely in all directions. The two slabs are a distance, 2a, from each...

[SOLVED] electrostatics problem Homework Statement Two spherical cavities, of radii a and b, are hollowed out from the interior of a (neutral) conducting sphere of radius R. At the center of each cavity a point charge is placed--call these charges q_a and q_b. Why is it necessarily true...

Hi everyone, From this website (link: http://hyperphysics.phy-astr.gsu.edu/HBASE/solids/fermi3.html#c1 ), we get the following expression: Population Density of Conduction Electron = \int ^{\infty}_{Egap}N(E)d(E) = \frac{2^{5/2}(m \pi k T)^{3/2} exp (-E gap/2kT)}{h^3} My questions are based...

Hey everyone, first post and having an issue thinking about a simple problem. I'm into chemistry so I struggle to get all of these physics ideas down correctly. The problem is about a conductor with a neutral surface. The conductor has a cavity with a point charge of +P inside of it. A...

Do in conductor (like Cu wire) have electron holes, like there is in the semi-conductors?

I'm a little thrown off by this because we there is no voltage value given... And how does the air play into the problem? I just something to help me get started: What is the maximum amount of charge that a spherical conductor of radius 5.0 cm can hold in air?

I have the problem A positive point charge of magnitude 2.4 micro Coulombs is at the center of an uncharged spherical conducting shell of inner radius 65 cm and outer radius 85 cm. I have been trying to calculate the total charge for the inner sphere. I solved for the Electric Field by...

Hi This question really matters me and I would like to someone to point me out (rigorously if possible) why and what makes charge move in ideal conductor. All good conductors are modeled as being ideal so that the Maxwell equations inside the conductor needs not to be solved. So as electric...

How exactly do conductors conduct electrons? I'm confident with Maxwell's equations and I can accept a classical treatment like \sigma=\frac{nq^2\tau}{m} where \tau is the scattering rate. So actually I'd like to know what exactly happens with the electromagnetic fields when a voltage...

What makes the electrons move in conductor, while I am moving the magnet among the conductor in closed circular loop? It is the magnetic force from the magnet, but why when I get close the magnet they start moving in direction, oppose of the magnetic force?

Homework Statement Put in plain words: "In a static situation, the electric field at the surface of a conductor can have no component parallel to the surface, because this would violate the condition that the charges on the surface are at rest." Would this same statement be a valid one for...

Good afternoon(or good morning,it depends on where you are :zzz:),this is my first topic in this great forum so don't be very tough with me okay? My question concerns the means of producing electricity and to be more precise:Electromagnetism. I read that if you move a conductor(such as copper...

Hello everybody, I got a small question and was wondering if somebody could help me with that. Problem: I have a square conductor with side length m. I am now trying to figure out what the magnetic field B is at any point inside that square. Here is what I've come up with so far and I think...

why is the magnetic field just inside a cylindrical conductor with inner radii a, and outer radii b carrying a uniform current I distributed throught it's croos section just 0 inside the conductor. I used ampere's law and that surely doesn't give 0

Imagine that there is a point charge in vicinity of an infinite grounded sheet of conductor of arbitrary shape and size such that the problem of finding the potential can be solved by using the method of images. Is their a way to prove that the total charge induced on this sheet is always equal...

Homework Statement Bill knows that a solution with an ionic salt dissolved in itwill allow a current to flow. Bill finds this quite interesting, so he finds a piece of plastic tubing and hangs it from an apparatus. He pours seawater into the tube until it is full. He then moves a magnet around...

Will the impedance characteristics for a length of stranded conductor be really close to an equivalent length of single core conductor? For example, can you expect the same impedance from a 20 ft. run of 12 AWG single core as you would from a 20 ft. run of 20 AWG stranded conductor? I know...

Why does the charge on a conductor accumulate at sharp points? I've read one or two explanations, but I don't follow them, and when I try to think about it I reach the opposite conclusion. Halliday and Resnick has an example where a large conducting sphere and a small conducting sphere are...

Hi Friends, I was thinking of having a either a point charge or some amount of charge at the center(let us say positive charge) and having a hollow concentric sphere( a conductor) around it. Now, there will be induced charge on the inside of hollow sphere and accordingly opposite charge...

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?

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 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...