Conductor Definition and 821 Threads

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...