Conductor Definition and 820 Threads

Homework Statement This is one of those problems with a U-Shaped Conductor, but this time it is at an angle and the Earth's Magnetic Field is perpindicular to the plane of it. The rails are 10m apart and the conducting rod weights 10 kg. No friction on the ramps, and the only resistance...

Does anybody happen to know what readily-available metal is the worst electrical conductor?

Homework Statement A copper conductor with a cross-section of A and a length of is connected to a battery with a electromotive force of U. The resistance of the conductor is R, and the internal resistance of the battery is negligible. U = 220 V l = 10 m A = 10 mm2 R = 0.01695 \Omega...

In this problem we assume that the photon mass is m > 0. We take a conducting sphere of radius R and put a charge of Q on it. Some fraction of the charge will then reside at the surface and a fraction will move into the bulk. Evaluate the volume charge density in the bulk. I was shocked to...

friends, in lightining conductor, a metal plate with number of spikes is connected to the top end of the conductor and kept at the top of the building. when a negatively charged cloud passes over the building , positive charge is induced on the pointed conductor. the positive charge ionise...

friends, there is no charge inside a conductor or to put in a better way " why electric charge resides only on the outer surface of the conductor" thanks in advance

http://www.theglobeandmail.com/news/arts/vancouver-maestro-saves-british-couples-big-day/article1250119/ http://www.telegraph.co.uk/culture/music/music-news/6015869/Conductor-Bramwell-Tovey-steps-in-to-help-bride-on-wedding-day.html

I found this sentence in my textbook very confusing: "...where k is constant of proportionality. If we follow SI units, the value of k is 1." Thus in SI units, F=kILBsin<theta>=ILBsin<theta> Why is the value of k taken as 1 only because we're following the SI units?

Homework Statement A 20cm wire carrying a current of 10A is placed in a uniform magnetic field of 0.3T. If the wire makes an angle of 40 degrees with the direction of magnetic field, find the force acting on the wire. Homework Equations F=LIB sin<theta> The Attempt at a...

Homework Statement Use Gauss' theorem (and the fact that the line integral of the electric field around a closed loop is zero, if necessary) to prove that a closed, hollow conductor shields its interior from fields due to charges outside. (This is 1.1b in Jackson, and it's not really homework...

Homework Statement Is the relative permittivity (ie.dielectric constant) of a conductor (metal) zero,or,infinity? Prof. Jaiswal in his golden physics (for XII std. CBSE) states that it is "zero". Another author Prof. Mohindroo in his book based on the same XII std. CBSE physics syllabus...

Homework Statement A long, thin conductor carries a current of 8.93 A. At what distance from the conductor is the magnitude of the resulting magnetic field 4.79 × 10−5 T? Answer in units of cm. Homework Equations B= Uo*I*l/(2*pi*d) The Attempt at a Solution i used this...

Two aluminium plates, each 150 x 150mm, were separated by 100mm to create a form of parallel-plate capacitor. A DC voltage of 300 volts was connected across the plates to create a (fairly) linear electric field of approximately 3000 V/m between them. An insulated conductor was bent into a U...

Two aluminium plates, each 150 x 150mm, were separated by 100mm to create a form of parallel-plate capacitor. A DC voltage of 300 volts was connected across the plates to create a (fairly) linear electric field of approximately 3000 V/m between them. An insulated conductor was bent into a U...

Homework Statement What is the magnetic induction at a point on a current carrying conductor itself according to biot -savart law? is it zero, infinity? Homework Equations The Attempt at a Solution

I'm trying to reconcile some concepts in electrostatics and dynamics to do with electric fields in conductors. The relative permittivity (constant) of a material seems to be determined by it's ability to be polarized and subsequently induce an electric field within a conductor or dielectric...

Homework Statement calculate total induced charge on a charged cylinder. where the surface charge density is given by sigma= 2eEo cos(phi) Homework Equations the total induced charge on the cylinder is Integral of (sigma) da can u calculate this integral fo me ... it very...

Homework Statement http://img16.imageshack.us/img16/6503/questiono.jpg Not sure which equations, pretty sure anything goes for find e fields like guass. I'm not even sure of the behavior of the system. Two conducting spheres with a charge on them, the field of each one just be...

Hi, skin depth tells us that an electromagnetic wave is attenuated but when is it reflected? When i aim light on a mirror its clearly reflected. My question is if its at the border ( right when it goes from air to metal) or at some place inside the conductor (if the latter, then how is a...

A metal is held by E.F...its an arrangement of electrons and kernels cause of which the metal sustains as a solid. Since Columbian forces are holding the metal together, there has to be an E.F inside the metal, or the fields of electrons and the kernels as holding each other to form the...

Homework Statement A dielectric of dielectric constant 3 fills three fourth of the space between the plates of a parallel plate capacitor. What percentage of the energy is stored in the dielectric? E(r) = 3, distance between plates = d, thickness (t) = (3/4) * d, C=capacitance of the...

Can someone please tell me how charge (electrons is distributed inside a conductor with a circular cross section for example? how can charge be UNIformly distributed within it and why is it that the E field inside a conductor should always be zero? what dictates that?

If a single conductor in a transmission line dissipates 6,000kWh of energy over a 24 hour period during which time the current in the conductor was 100 amps. What is the resistance in the conductor. So could I just conver the kWh of energy to kW by dividing by 24 hours...than just use ohms...

Hi Guys, :smile: The following query would sound a bit ridiculous and abstract but it suddenly popped up in my head. :-p What would happen if I were to apply a purely sinusoidal AC voltage across a zero resistance conductor (theoretically, a super conductor) ? Zero resistance would mean...

Hi, Frankly, I'm new to this forum. So please do guide me if I posted wrongly. I need some help in sizing the neutral wire. For a 3 phase 4 wire system (3Ph + N), what is the recommended size of the neutral conductor. Should it be the same as the phase conductor or should it be 50% of the...

Maybe one day I'll be able to answer questions instead of ask them... Is there a critical ac frequency for a super conductor? I know there's a critical current density and critical field, but assume we stay below those levels. Thanks.

I have two conductors in no magnetic material such as copper. One has diameter 20mm and other has diameter 50mm and both through by same current about 100A. Where do i have the maxi magnetic field on surface of conductor...I tinks on conductor with diameter 20mm..Is exactly ?

Homework Statement Homework Equations l = 0.02 m r = 0.3 m E = \frac{-d\phi}{dt} \phi = BA The Attempt at a Solution A = \pi 0.32^2 - \pi 0.3^2 = 0.0124\pi ...Area "cut" by conductor \phi = 1.5a_r0.0124\pi = 0.0186\pi a_r ...change in flux in one revolution 1600...

Homework Statement Show that any charge distribution in a conductor of conductivity σ and relative permittivity κ vanishes in time as ρ = ρ0exp(−t/ζ) where ζ = κǫ0 σ Homework Equations Maxwell's equation ∇ · D = ρfree equation of continuity for a free charge density ∇ · Jfree =...

[solved] electric potential: point charge in a hollow charged conductor Homework Statement A hollow spherical conductor, carrying a net charge +Q, has inner radius r1 and outer radius r2 = 2r1. At the center of the sphere is a point charge +Q/2. d) Determine the potential as a...

Homework Statement A long circular rod of radius R, made of conducting material, has a cylindrical hole of radius a bored parallel to its axis and displaced from the centre of the rod by a distance d. The rod carries a current I distributed uniformly over its cross-section. Consider the...

Homework Statement A. Two infinite thin sheets of charge are placed perpendicular to the x axis. The surface charge densities of the two plates are (SC density 1 = 8.5 C/M2) and (SC density 2 = 1.5 C/M2. Placed near plate 2 is a think conducting metal plate with a (SC density of -3.0 C/M) Find...

Homework Statement http://www.aijaa.com/img/b/00815/3678868.jpg Homework Equations B= \frac { \mu _0}{2 \pi r}I d \phi = \vec{B} \cdot d \vec {A} The Attempt at a Solution I know the magnetic field of the conductor is B= \frac { \mu _0}{2 \pi r}I. And in order to solve the magnetic flux...

Homework Statement -------------------------------------------------------------------------------- Here is a problem I made up, in order to try to understand electrostatics of conductors better. Suppose two large square parallel conducting plates, are in space. One has a charge of Q, and...

An uncharged solid spherical conductor is placed in a constant electric field \mathbf{E_0}. Find: a) the reulting potential and electric field b) the induced surface charge density and sketch the field lines c) the force on the sphere I don't have a scooby where to start here so any help...

You are given a piece of metal of one square cm area and 10cm long. You do not know whether it is a conductor or a semiconductor. Devise some experimental setup to know the nature of the material.

Hi all, My name is aldo and I am mechanical enginner. My job is specialist in non-destructive testing in aeronautic sector. The typical method for to magnetize this components is circular magnetization by central or offset central conductor. Usually the central conductor is a copper bar. When I...

Is E=0 in super conductor also? I read in the below site that static electric field goes some depth into super conductor? Is this true? Classical physics says E=0 in conductor. so, what is the difference ordinary conductors and super conductors? http://adsabs.harvard.edu/abs/2002APS..MARA12009T

Homework Statement Show the electric field inside an empty cavity in a conductor is zero, even if there is a charge outside the conductor. If a charge is placed inside the cavity, will there be an electric field outside the conductor. Explain Clearly. Assume that both the conductor and cavity...

I have a few questions on three circuits problems that I have already solved. I explained how I arrived at my answers and included diagrams. I would appreciate any help in confirming that my answers are correct. Thank you! 1. The diagram below shows electric currents in conductors that meet...

Homework Statement The question is as shown on the attachment. Homework Equations F = BIL The Attempt at a Solution To find the magnitude of the force I used the equation "F = BIL" and then I put in the values for each (B=0.25, I=15, L=0.20) and I got an answer (magnitude) of 0.75...

I need to calculate the size of a force acting on a conductor if the length of the conductor is 200mm, the flux density is 2 tesla and the current flow is 5A. thanks, cs

Suppose you have a long wire. One end of the wire is close to a very very strong source of electric field. It is my understanding that the electrons responsible for bonding in a metal are also those responsible for conduction. If you have an extreme electric field near to the conductor, and...

[b]1.Prove that free charge resides on the surface of a conductor.(Using Gauss's law or laws of capacitance) Homework Equations The Attempt at a Solution I could not figure out how to prove this using Gauss's law,though i tried to solve it using the laws of capacitance.This is what i did- Let...

I am reading an electrodynamics book to grasp the concept of bound and free charge, esp in conductor and dielectric. I got lost with the text on the book. Can anyone please help me understand the concept well?

Homework Statement Find the surface charge induced on an infinite conducting plate by a point charge +q at a distance a from the plate. The Attempt at a Solution As you probably know, this problem can be solved using the well-known fact that the induced electric field is equivalent to...

Homework Statement Basically there is conductor shell which is in the shape of a semicircle. It extends to infinity. (Think of this as like half of a cylindrical conductor shell). The radius of this shell is A, and it carries a total current of X. The shell extends infinitely into the...

Does anyone know of an experiment or know where I can find an experiment to compare the heat gain or heat loss by a conductor and an insulator?

Hello All, I am wondering how to calculate the electric field intensity needed to rip an electron from the conduction shel of a copper wire. I am not sure exactly where to look for this information but I know it is related to something like a cold-cathode effect where HV is used to pull...

Homework Statement The question given is an electromagnetic wave incident on a vacuum metal interface. The wave is incident normally. We're given that the metal is a good conductor i.e. \omega \tau <<1 where \tau is the collision time of the metal and omega is the angular frequency. The metal...