# 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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### Do conductors have bound charges?

In Griffiths, the total charge density of a dielectric is: $\rho$ =$\rho_b +\rho_f$. I have several questions: Can the total charge density of a conductor be written as the equation above? Do the ...
27 views

### What is dielectric constant of conductor if it is connected to battery as the electric field will generate in conductor does it still be infinite? [closed]

as we calculate dielectric constant of conductor saying Eext/Eext-Einduced = 0 but as inside conductor electric field net would be not equal to zero. `
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### Will the electrical potential difference between the Windward and Leeward sides of a mountain range generate electrical current?

I would like to know if it is possible that the electrical potential difference between the Windward side and the Leeward side of a mountain range, due to a thunderstorm occurring on the Windward side,...
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1 vote
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### Visualization of resistance [closed]

What does a resistor do in an electrical circuit? Does it impede the flow of electrons by increasing offering a path that offers a large no. of collisions? How can i visualise it, i have been told to ...
1 vote
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### Charge besides conductor

This is a curiosity What would be net charge induced on a (say spherical) conductor when a positive charge is placed besides it. What I think is that a negative charge will be induced on surface near ...
1 vote
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### How do conductors actually work in electrostatics? [closed]

I am mainly confused because we are learning about conductors in electrostatics, and I always think of an electric wire connected to a phone charging it (a phone charger). So, when I hear "...
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1 vote
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### Confusion regarding phase

As far as I know about phase if the phase difference between two waves is positive, the former is leading..and the latter is lagging. Then why has D J Grifith stated this? If the phase of the magnetic ...
1 vote
51 views

### Charge distribution in two concentric conducting shells connected by a thin wire

Above is the content of the problem in the title and I'm confused about the solution. I'm not sure whether it is correct or not. The two shells are conducting and connected, so the difference in ...
148 views

### Why don't positively charged metal ions (in a wire) move but electrons do?

I'm very confused on this question. I've researched online but I can't seem to find the answer anywhere: all I was told was that electrons move (as part of electron flow) towards the regions of high ...
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### Charge conservation in ohmic material - Apparent paradox

Consider an ohmic material with constant conductivity, which obeys the relation: $$\vec J = \sigma \vec E$$ where $\vec J$ is the current density and $\sigma$ is the conductivity. Applying the first ...
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### Surface charge density within a parallel plate capacitor on different voltages

I need a way to vary the surface charge density without changing the electric field. My idea is to use two large conducting parallel plates close to each other in vacuum enclosed in a grounded vessel (...
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1 vote
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### Metallic bonds in Copper and Electric field application

Didnt know where to put this since its like a combination of Chemistry and Physics. But in the picture below, we can see that they've defined a metallic bond as essentially the attraction between the ...
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### Induced charge on conducting sphere sliced by a plane

We are given a conducting solid sphere, and it is cut by a plane as shown. A charge $Q$ is given to the smaller part of the conductor, and it is required to find the induced charge on the surface of ...
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### Why is the Poynting flux not conserved across the interface between two conducting materials?

This question is part of my attempt to use an answer to another question I've posted on this site. If I have two materials with complex indices of refraction, $\widetilde{n}_0$ and $\widetilde{n}_1$, ...
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### Uniqueness of charge distribution in conductor

I found out about a result describing the uniqueness of the charge distribution on a conductor. It says that for a given total charge on a conductor and a given charge distribution of the outside (...
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### How do charges on two conductors charged by the same battery relate to each other?

Let’s consider 2 neutral conducting spheres, L and R, with different radii. There is a battery somewhere in the middle between these spheres. The battery has potential $\phi_{B-}$ on its negative ...
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### Accumulated charge in conductors

Conductors placed in electric fields undergo a redistribution of charges. There is a separation of charges which occurs only on the surface. But what prevents the charge from leaving the surface of ...
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1 vote
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### Gauss's Law vs Image charges

Consider a grounded shell of radius $R$, inside is a point charge $q$ at a distance $a$ from the centre. Now, this charge would induce an amount of charge $-q$ on the conductor, whose field would be ...
123 views

### Can aluminum shield magnetic fields?

Say I have built a simple working AC 50 Hz transformer. It has copper coils at each end of a soft iron rod. If I slip an aluminum tube over the soft iron rod, so the copper coils now are over the ...
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### A General Analysis of Charge Distribution inside conductors

I'll go ahead and present my question straight-forward and then talk about the calculation details.My Question is: how do you define a conductor in Electrostatics? What are the basic(minimum) set of ...
15 views

### Why does charge reside on the outer surface for a conductor but inside in case of an insulator? [duplicate]

So from what I understood, in case of a conductor there are free electrons and when its charged there is maximum repulsion between the like charges which causes the electrons to reside on the surface ...
90 views

### Induced charges due to uniform electric field

Suppose there is a finite metallic conductor placed in a uniform electric field. Will the magnitude of positive or negative charge induced on it depend on its shape or will it only depend on the ...
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### Surface charge density in conductors

I was learning about conductors — mainly solid spheres and hollow spheres — and my teacher told me that in the case of solid spheres with a spherical cavity and a charge at the centre of the cavity ...
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### Confusion regarding a statement regarding conductors [duplicate]

While discussing conductors, our lecturer told us that, UNDER ELECTROSTATIC CONDITIONS, electric field is zero in the "meat" of the conductor. Using this assumption (and using Gauss law), ...
47 views

### How do I create a highly conductive vapor cloud? [closed]

I'm working on a project that requires that I create an electrically conductive gas cloud that can conduct voltages as low as 1.5v from a regular double A battery. I've been looking into using mecury ...
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### Can two positive electric conductors attract each other in some cases?

Can two positive conductors attract each other in some cases? In my opinion, let me denote the two conductors by $Q_1,Q_2>0$. Suppose $Q_1>>Q_2$ and $Q_2$ is really small. Let a tip of $Q_1$ ...
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### Multiple cavities in a conductor and a charge outside [closed]

So I came across this problem: A spherical conductor 'A' contains two spherical cavities as shown in figure. The net charge on conductor itself is zero. However, there is a point charge $q_{1}$ at ...
1 vote
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### Charge induced on a parallel long plates when one is earthed [closed]

Consider two Long Parallel plates at a distance 'd'. The one on the left has charge Q1 and right plate has charge Q2. Now the right plate is earthed using a conducting wire so the charge on right side ...
1 vote
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### What is the potential of a conductor between two eletrically-charged plates?

Let's say I have two plates. One is at +20V, the other is at +10V, and they are separated a meter apart. I place an uncharged conductor that's 10cm wide into the gap between them, 20cm from the plate ...
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