Questions tagged [conductors]
For questions about materials which allow the flow of an electric charge (electrical conductors) or the transfer of heat (thermal conductors) through them.
1,438 questions
1
vote
0
answers
15
views
Maximizing the Magnetic Flux through a give condition [closed]
Suppose you are given a wire of fixed length $L$ and an ideal power supply providing a constant voltage $V$. How should the wire be arranged (for example, into a loop or coil) in order to maximize the ...
- 11
3
votes
5
answers
352
views
Why does the standard explanation relating conductivity and transparency fail for transparent conducting films?
The standard "quick and dirty" explanation for transparency in solid materials goes like this: if the Fermi level is located deep within a band gap, so that the band gap energy is larger ...
- 52.9k
5
votes
3
answers
2k
views
Electric field due an off-center charge in the cavity of a spherical conductor
I am new to this subject, and there's a problem that is really bugging me. If we put a charge $q$ inside the cavity in a spherical conductor, even if it is off-center, the charges on the outer surface ...
- 279
0
votes
2
answers
129
views
Analysis of surface charges on a wire
If I have a capacitor producing a potential difference $V$, forming part of a large conducting loop with total resistance $R$, then clearly the steady current in the loop is
$$
I = \frac{V}{R}.
$$
...
- 278
4
votes
3
answers
455
views
Current, resistance, temperature and area
As we know that resistance is directly proportional to temperature. So if we heat a conductor then temperature increases, the conductor expands, so area increases.
Since resistance is inversely ...
0
votes
1
answer
125
views
Is it valid to derive a line charge density on a conducting needle by averaging a known ribbon surface density?
I consider a thin perfectly conducting needle (idealized as a 1D conductor) occupying the line segment $x\in[-a,a]$ on the $x$-axis in $\mathbb{R}^3$. Let the total charge on the needle be $Q$. I want ...
- 149
8
votes
1
answer
776
views
At what speed does a pulse propagate in a conducting wire?
I saw a previous post asking about how fast "electrical information" propagates, i.e. if I change something in a circuit, like capacitance, resistance, voltage, in a circuit, how fast will ...
- 1,466
3
votes
1
answer
557
views
How is this ratio formula for two conducting balls true?
I recently skimmed through my tutor's physics book, it's not the greatest book out there since it doesn't provide much detail about how the physics works rather its more like a compilation for ...
- 135
-4
votes
2
answers
137
views
Why does heating effect $H\propto t$ not melt the conductor?
$H=I^2Rt\implies H\propto t$ okay, but let a maintenance system ensure continuous identical flow system of electric current conserving I²R approximately over a long time, say years (practically ...
user471527
0
votes
2
answers
92
views
Touching a conductor carrying eddy current
When we touch a conductor with eddy current flowing on it, will we get a shock?
Because in my opinion there's an induced EMF due to which eddy current flows (assume the conductor is in the region ...
3
votes
1
answer
102
views
Effect of non-self-adjointness on correlation functions of momentum for the particle in a box
I would like to calculate the optical conductivity of a particle in a box, which means calculating a correlation function of the momentum operator. The momentum operator appears in the calculation ...
- 613
0
votes
3
answers
122
views
When do we consider that grounding the conductor makes the potential zero?
When do we consider that grounding the conductor makes the potential zero?
I was recently seeing why is the outer charge of the system of grounded conducting plate becomes zero, and the reason given ...
- 45
1
vote
2
answers
406
views
Will an off-center charge inside a conducting shell experience a force, or is the force zero? [duplicate]
I have a fundamental question about the force on a charge inside a conducting shell that I can't resolve.
The setup:
Take a hollow, spherical conducting shell (it can be charged or uncharged).
Place ...
1
vote
0
answers
47
views
Confused about derivation - electron gas with binary collisions and impurities scattering
I am confused about a derivation for the behaviour of electrons in a conductor with binary collisions, and scattering due to static impurities. The derivation begins as follows:
The distribution ...
-1
votes
2
answers
172
views
Why is the electrical field outside spherical (shell) conductor radial if the charge $q$ inside is not concentric with the shell?
Suppose we have a spherical shell that is a conductor and randomly inside the shell a charge $q$. Then inside the shell the electrical field should be $0$. Why is that?
I'm thinking that the ...
- 131