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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164 views

Field inside a conductor?

If the above image is a cross section of a conductor, the field at the point shown is not zero. So the field inside a conductor is not zero at all points. You could argue that the electrons would ...
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277 views

Resistance of a Wire [closed]

The resistivity of iron is $10\times10^{-8}\,\text{ohm-meter}$. A wire made of iron of length 15 m, and diameter 2.9 mm,will have a resistance of ___ ohms. I calculated it using $R = \text{resitivity ...
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1k views

What will be the effect on Coulomb force if any conductor is placed between the electric charges?

I know that if any insulator or dielectric is placed between the electric charges then coulomb force decreases by factor known as dielectric constant.So, what will the effect when any conductor is ...
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1answer
517 views

What is the difference between atomic density and intrinsic concentration?

If a Si sample is doped with boron impurities in the ratio of 1:10^6, it means that for every 10^6 Si atoms, 1 boron atom is added. I have been given information that atomic density of Si is 5*10^22 ...
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321 views

Will charge transfer without friction

I know rubbing two objects of different materials together will result in a negative charge on whichever material has a higher electron affinity. However, I was wondering if a negatively charged ...
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1answer
802 views

Is there any material which is non magnet & conductor [closed]

Magnetic materials and conductors
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2answers
158 views

Why does electrostatic potential inside a conducting spherical shell seem to violate superposition principle?

I want to find the potential at the centre of a conducting spherical shell; The conducting shell bears a total charge of $Q$. The shell has a radius $R$, and there is a point charge of magnitude $q$ ...
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2answers
59 views

Some questions regarding electric properties of materials [closed]

I was reading Chapter 29 on Halliday-Resnick-Krane regarding this but couldn't understand these things. Suppose you have a conductor in an electric field. In normal conditions the field inside the ...
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1answer
144 views

Can four probe method be used to find resistivity of metals?

Can we use four probe method to find resistivity of metal/conductor. I searched the question on google, but could not find the answer. My guess is that we can use. Why not?
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1answer
406 views

A point charge near an infinite conducting plane

I want to calculate (with Poisson's equation) the electric field in the region containing a point charge near an infinite conducting plane with 0 potential. My textbook uses V(x,y,z)= 0 for every x,y,...
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1answer
365 views

Physics of throwing a power cord into a swimming pool

I saw a few questions related to swimming pools so I figured out I may ask here. If one takes a power cord that's plugged into a wall socket on one end and throws the other end in a bath, it may kill ...
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1answer
491 views

Charge above grounded plane

To find the electric field discontinuity $$\vec{E}_{above} - \vec{E}_{below } = \frac{\sigma}{\epsilon_0}\hat{n} \implies \frac{\partial V_{above}}{\partial n} - \frac{\partial V_{below}}{\partial n} =...
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44 views

How electric current is defined in a metal wire?

How current is defined if in a metal wire both positive and negative charge exist? Isn't the total charge/time 0?
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96 views

Relative Permittivity in a “Good Conductor”

I have a question in which I need to show that sea water is effectively a "good conductor", when considering the propagation of radio waves of frequency $< 10^9$. We're given that the conductivity ...
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1answer
104 views

What happens if I place a charge inside a hollow conductor and fix it? [duplicate]

So I know that when you put some charge inside a counter, it resides uniformly on the surface of the conductor in order to make the electric field zero everywhere inside the conductor.. But what if I ...
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1answer
32 views

Can we infinitely charge a hollow metal sphere? [closed]

I know this isnt practically possible due to dielectric breakdown of the surrounding medium but otherwise ...what would be the outcome? Following is the link of the question which came up for me in a ...
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3answers
100 views

Current, conductors and charge density

Ok i read that the charge (current) entering the conductor is same as that of charge leaving through the conductor Means current is same at all the points in a conductor having varying cross section....
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2answers
47 views

Consider a conductor, we created a potential difference at the end of it

Consider a conductor, we created a potential difference at the end of it . Therefore , The electric field is produced inside the conductor. Now my question is: how is this electric field? Is the ...
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1answer
170 views

What is the name of metal-metal junction?

When two different metals come in contact, a junction at their contact is created. What is the name of that junction?
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1answer
63 views

Heat that we feel [duplicate]

I have just came across a site saying that when we touch a good conductor and if it's temperature is a lower than our body we feel it cold as heat starts flowing from our hands to it. On the other ...
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2answers
881 views

What is the potential variation inside solid conducting sphere? [duplicate]

The information on the internet is highly unreliable, these websites say that potential remains constant inside conducting solid sphere: Electric potential inside a conductor http://...
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2answers
502 views

Does the surface charge density at the peak of a conical projection is smaller than that of on the peak of a conical hole?

The question is, A solid spherical conductor has a conical hole made at one end, ending in a point B and a small conical projection of same shape and size at the opposite end, ending in point A. If, ...
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1answer
47 views

Work required to bring particle towards grounded plane

I have a quick question: If you suspend a charge $q$ above a grounded conducting plane a distance $z$ above the plane, you get that the charge induces a negative surface charge on the conductor. The ...
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1answer
1k views

Why does the metal ball have no appreciable charge?

here is the question: A hollow conductor is positively charged. A small uncharged metal ball is lowered by a silk thread through a small opening in the top of the conductor and allowed to touch its ...
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1answer
710 views

How to calculate flux density in a toroidal CT that has an electrical line pass through the center?

I have seen the Biot–Savart equation, but I don't know how to apply it. Does the conductor length need to be considered finite and equal to the core length, or will the calculation be for a conductor ...
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1answer
94 views

Why cannot we use thick wire in alternating current production? [closed]

Why cannot we use thick wire in alternating current even though thick wires have got low resistance as $R$ is inversely proportional to area of cross section?
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2answers
466 views

Charge distribution in a hollow sphere [duplicate]

In electrostatics, why in the internal surface of a hollow charged sphere there aren't charges?
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1answer
66 views

Why is resistance $U/I$ rather than $I/U$?

What is the difference between resistance and conductance and why is resistance $U/I$ and not $I/U$? (I know $I/U$ is conductance.) But I don't see the difference between both.
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1answer
180 views

Why the electric field inside a capacitor isn't nul?

I have a doubt regarding this point, i know that the electric field inside a conductor is null, and the capacitor is made by two conducting plates, so what s the point here?
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1answer
93 views

Doubt in electrostatics

I have studied that charges lie on the surface of a conductor i.e. no charges exist inside the body. Then why doesn't charges in a wire (through which electricity flows ) come to surface?
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3answers
718 views

How can the copper wire in an electricity generator provide an infinite number of electrons? [closed]

How can copper wire in an electricity generator produce an infinite number of electrons when the is a finite number orbiting each copper nucleus?
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1answer
476 views

why is electric field inside a conductor zero? [duplicate]

I know that the net electric field inside a conductor is zero due to field made by induced charges. But , IS IT NECESSARY ? what i mean is that what would happen if the net electric field inside a ...
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1answer
318 views

How electricity works acutally?

I've been told that electricity is due to flow of charges(-ve charge=electron) that are provided by the battery. And no. of charges that leave battery at one end are equal to no. of charges that re-...
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1answer
427 views

Factors affecting Capacitance

In case of a parallel plate capacitor, I knew that capacitance is affected by area, separation between plates and dielectric medium. so am I right with the idea in the given picture?