# 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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### Mathematical proof that electric vector field in charged hollow conductive sphere is zero

I placed 250 evenly spaced identical positive charges Q=0.01 each (ignoring coulombs constant) around a hollow unit circle in mathematica and calculated the electric vector field: ...
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1 vote
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### Electric field outside conductive surface with internal charge density

My professor told me that if you have a charge distribution $\rho \ne 0$ defined on a bounded region $V \subset \mathbb{R}^3$ whose boundary is a regular $2$-dimensional surface $\partial V= S$ which ...
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### Why is the electric field between two equally charged conductors zero?

Two equally charged conductors of area $A$ and charge $Q$ are placed at a distance $a$ from each other. I want to calculate the electric field caused by the two conductors. I applied gauss law to each ...
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### Why is current finite for point charges?

If an electron passes through a flat plane, then there will only be a single point in its entire path which lies on the plane,i.e the entire charge of an electron passes through in an instant (as it ...
1 vote
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### Conducting Sphere with a charge inside

What happens if we put a charge inside a conducting sphere(not a shell)? If we take a gaussian surface around the charge then we find that there should be charge at every radius of the sphere. But ...
3k views

### Why is the charge enclosed by a metallic conductive sphere zero?

The reasoning provided behind why the electric field inside a metallic conductive sphere is zero, in my textbook is - "In case of a metallic (conducting) sphere, the entire charge will reside on ...
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### Apparent violation of Gauss Law

Consider the very long, current-carrying wire in the picture. On the left side in yellow, the wire has a very low resistance, that we will consider to be zero. But on the right hand side in green, the ...
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### Equipotential surface

If we place a charge near a conducting sphere and the sphere isn't grounded since the opposite charge will get induced on nearer side and same sign (as of outer charge) charge will get induced on ...
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### How to understand electron drift velocity?

I know that electron drift velocity can be defined as $I$ = $nAve$, where $I$ is the electric current, $A$ is the cross-sectional area of a conductor, $v$ is the electron drift velocity in question, ...
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1 vote
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### Two charged spheres connected by a wire and one is inside the other [closed]

Two charged spheres are connected by a wire, a small sphere is located inside a bigger one. Both spheres are charged and connected through a wire. The charge of the small sphere is 20µc and the charge ...
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### Do electrons really move on the conductor?

For my understanding: Maxwell's equations combined with Poynting's theorem give us a model where electricity is energy carried along with the electromagnetic field (energy is stored in the field, not ...
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### Can heat(?) flow from a cold object to hot object?

When we dip a spoon (stainless steel) into ice cream, does it becomes cold or stay the same temperature? If it does, can we say that heat(?) can flow from cold to hot objects? Is this the reason ...
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### Charge accumulation on surface of solid sphere due to placement of dipole inside cavity

This is the case when a plus q charge is inside cavity (with same centre) of a spherical solid conductor. Everything is uniform. But what will it be like in second diagram I think the external ...
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### Classic Image problem

The classic image problem: Here, to calculate the potential above an infinite grounded conducting plate and a point charge q held at distance d above the plate, the image method is used. Here, I want ...
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### Does a perfect conductor has unlimited supply of charges?

In Griffiths, it has been written that A perfect conductor would be a material containing an unlimited supply of completely free charges. My question is, how is the unlimited supply of charges ...
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### Explaining Valence Electrons

I want to explain the concept of free electrons in a conductor vs. an insulator as simple as possible for children that have not yet learned about valence electrons. Would it make sense if I explained ...
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### Are there perfect conductors which do not display perfect diamagnetism?

A superconductor is a perfect diamagnet AND and a perfect conductor. Are there perfect conductors which are not perfect diamagnets ? Maybe topological insulators ?
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### Does charge always reside at the edge of a conductor's surface

Say I have a circular metal sheet with a charge $Q$ on it do the field lines come out from the edges alone or from across the entire sheet?
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1 vote
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### Does microwaves nevertheless pass through smaller slits?

It is known that the Foucault currents prevent the microwaves to leave a microwave oven (MWO). The waves can not pass tru several times smaller openings than their wavelength because the grid of the ...
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