Conductor Definition and 790 Threads

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.

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...

Is colder water a better thermal conductor then warmer water? Say for example you nee dsomething to be cooled at 70C and you run water to it in a system. Which would cool this "something" quicker, 10C water or 20C water?

Two students performing a Hall voltage measurement using germanium as a semiconductor reversed the magnetic field while holding the bias current constant but did not get opposite signs for the Hall voltage. The magnitude of Hall voltage detected using a voltmeter was the same as it must be...

Hey, i have this question: The electric potential inside a charged spherical conductor of radius R is given by V = keQ/R and outside the conductor is given by V = keQ/r. Using E=-dV/dr, derive the electric field inside this charge distribution. Alright, so I started to find the derivative of...

How come the electric field inside a conductor is equal to 0? How do you explain with Gauss's Law?

Consider a long conducting rod that is suspended by insulating strings. Assume that the rod is initially electrically neutral, and that it remains so. The rod is positioned along the x axis, and an external electric field that points in the positive x direction (to the right) can be applied to...

Why is Al3 a conductor and Aluminum Trioxide is not?

Hi all, I need help on the following problem: A solid spherical conductor S contains 2 small spherical cavities (not-concentric). The total charge on the conductor is zero, but at the center of each cavity there are two point charges q1 and q2 respectively. At large distance r away from the...

I got a question: when a conductor is charged with current electricity, does it create any kind of magneticism strong enough to affect the present magnetic field, and how do you calculate the amount of magneticism generated? thanks a lot

Hi, I have two questions. The first is on the charge at the surface of a conductor. Let's say we have a charge distribution at the surface of the conductor, but there is a spot on the conductor that is not at the same potential. The result will be that there is a motion of this charge...

I have a question about the surface charge and the potential. My physics book states that the potential inside the conductor is the same at the surface. But the potential is just the electric field times the radial distance. Does this mean that it is possible to determine the electric field at a...

If a charge q was placed inside a cavity inside a metal shell, then inside this shell would there be any electric field?? And since Gauss law says that this metal surface would have an induced charge then a point within the regoin between the cavity and the outer surface of this shell thn...

Hello, Previously, I asked about a single charge inside a solid metal sphere. And I said that it would not be possible to represent the charge at the surface, because there is no driving force to cause migration. I talked with a professor and he told me that in that case it is called...

how does the potential of the conductor decreases when it is charged by a charged body that means if the negative charges are attracted or repeled due to nearby charged body the potential decreases .how is that

I am passing Xamps thru a Ylenth of conductor for time t sec. can anybody suggest me how to calculate temperarure rise in the conductor after time tsec in a conductor

how does resistance of semi conductor decreases as ionisation increases

Good conductor Of Electricity Can anyone help me by answeing the following question :- "Please name a Solid which is good condcutor of Electricity, but is a non-conductor or at least a bad conductor of heat? and is easily available." In the context of the above question I may add that...

Greetings ! I was wondering how (or if) a superconducor can be connected to a "normal" conductor in an electric circuit ? I guess the conductor-superconductor connection is easy, but how do you avoid problems at the reverse connection - do you need some amplifier or something. Also...

I'm trying to find the equation for an electric field at a point outside of a cyllindrical conductor. Any help would be greatly appreciated!

Please read this topic first. I have recently seen a proof (using Gauss' law) showing that there is no electrical field inside a charged metallic conductor (due to the carge on its surface). (i can provide this proof if needed) If that proof was right, then this must mean that the inner sphere...

I'm revising for my exam and got stuck in the following questions. Please help. 1) An isolated spherical conductor of radius r is charged to a potential V. The total electrical energy stored is _______. This is an MC question and the answer is V2(2*pi*εo*r) I only know energy stored...