# 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.

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### Confusion regarding solution of a problem of conducting spheres

Two conducting spheres of radii $r_1$ and $r_2$ are connected by a metallic spring of stiffness $k$ and natural length $l \gg r_1, r_2$. A positive charge $+Q$ is slowly delivered to any sphere. Find ...
5answers
71 views

### How do photons reach thermal equilibrium with the walls of the blackbody cavity?

There's a lot that has been confusing to me about Planck's radiation law, and at this point I feel like I've got the hang of most of it. There is really only one last question that I can't resist ...
3answers
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### Why is voltage not affected by wire length even though it is mathematically given as ($V=E\cdot d$), for a wire of length $d$?

If there is $1C$ charge in other side of a battery, the potential being $$V = k\frac{q_1q_2}{r}$$ should change as $r$ changes.
1answer
14 views

### Charge on a conducting sphere

As far as I know, to have a net flex through a closed surface there must be a charge inside it. However, what if I have for example a conducting sphere where the charge accumulate on the surface, will ...
1answer
53 views

### Gauss's Law for planes

Why when we apply Gauss's Law on a conducting plane we choose the Gaussian surface to be a cylinder which one end of it is inside the conductor, whereas when we apply Gauss's Law on an insulating ...
2answers
53 views

### How does earthing happen?

Earthing, as I have been told, is done by inserting a conductor in the ground whilst it is connected to the body whose earthing needs to be done. But how does the charge get transferred into the ...
1answer
62 views

### Is drift velocity of electrons 0 in 0 resistance wire?

In a 0 resistance wire electric field inside the wire is 0 as there is not potential difference . Which means when charges once start to flow ,no external force acts on them and therefore no electric ...
2answers
25 views

### How does a battery bring conductors out of electrostatic condition?

What does a battery exactly do to the conductors (eg metals)? How does it develop a field inside a conductor? On applying external field to the conductors (* I think that there will be a potential ...
1answer
33 views

### Contribution of inner induced charges to the electric field outisde

We have an arbitrary hollow shaped conductor, with small thickness. Suppose we place a charge $q$ at any arbitrary location within the hollow shaped conductor. By Gauss's law there will be a total ...
0answers
29 views

### Why the electric field inside a solid sphere is non-zero according to gauss while we know that the electric field inside a conductor is zero?

We know that the electric field inside a conductor is zero, but in my book, according to Gauss' law, the electric field inside a solid sphere (it's not mentioned if it's a conductor or non-conductor) ...
1answer
59 views

### What exactly causes resistance?

According to Ohm's Law, $V=IR$. Here $R$ denotes the resistance. It's the way I was introduced resistance. The definition is not convincing me. First of all I don't understand what causes resistance? ...
2answers
51 views

### Does superposition principle of electric fields hold for conductors?

Suppose we have two identical oppositely charged spheres separated by some short $x$ distance, then if we say that superposition principle holds, then at all points in space outside the conductors, ...
1answer
39 views

0answers
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### Band theory Splitting of levels

In the band theory of solids, when various energy levels create bands which levels are these.? For example for a single Copper this is how electrons are packed: 1s2 2s2 2p6 3s2 3p6 3d10 4s1. So when ...
0answers
24 views

### Are there any viable replacements for Indium-Tin Oxide electrodes?

I am looking to obtain a metal oxide ceramic that can be synthesized from a Sol-Gel procedure that is both conductive and flexible. Indium-Tin oxide does apply in this case, however the cost of Indium,...
5answers
120 views

### Why is the electric field inside a conductor zero at every point?

There are a couple of arguments on how the electric field inside a conductor is zero. Some of them appear to me to be unreasonable; I will explain. Let's consider a charged conducting sphere. I ...
3answers
59 views

### Why Does Resistance of a Conductor Increase With Length?

Most common explanation is as wire is longer electrons experience more collisions as they move from one to the other end of the wire. While I agree with this what I don't understand is that for DC, ...
1answer
39 views

### Electric Field due to charges inside cavity

Imagine a conducting body as shown: A positive charge +q is placed inside the cavity of the body. Now due to induction a negative induced charge -q has appeared on inside surface of cavity. Is the ...
1answer
60 views