All Questions
Tagged with electricity conductors
160
questions
7
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5
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1k
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Hollow conductor containing charge: why is internal field cancelled outside and why are the field oustide the cavity zero inside the cavity?
I've a doubt on the following situation. Consider a hollow conductor $A$ (of arbitrary shape) containing another conductor $B$ (again of arbitrary shape), with a positive charge $+q$.
By the ...
- 2,617
0
votes
2
answers
3k
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Is it safe for a man standing inside a Faraday cage to touch it from inside
Will a man get electrocuted if he touches a Faraday cage from inside when a high potential difference is developed between a Faraday cage and some other source?
If yes then how a person wearing ...
- 187
12
votes
2
answers
16k
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Where do all these electrons come from? [duplicate]
I'm a high school student and I'm fairly familiar with basic electronics, but I've always wondered one thing.
So how generators make electricity from motion is the move a magnet around or through a ...
- 919
0
votes
1
answer
583
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Why are spheres supposed to become discharged?
Source of image: Fundamentals of Physics extended fifth edition by Halliday, Resnick and Walker. Concerned to First Paragraph.
Why in the rejected scheme, Spheres are supposed to go neutral (or ...
user104909
0
votes
2
answers
481
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Conduction and ionic conduction
How is ionic conduction different from normal conduction? Do the electrons that leave atoms completely conduct in ionic conduction while in normal conduction the conduction takes place through valence ...
- 1,441
0
votes
0
answers
37
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How am I obtaining silicon with resistivity proportional to the number of conduction electrons?
The resistivity of silicon is given by
$$\large\rho=\rho_0e^{\Large{{\frac{E_g}{2k_BT}}}}$$
and the number of conduction electrons in a semiconductor conduction band is
$$\large n_{\text{...
- 4,607
3
votes
1
answer
525
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How do electrons move at an atomic level? [duplicate]
This was meant to be a sub question in the comments of my last question but I think it is big enough to have its own post.
I know that electrons move because of the potential difference across the ...
- 705
-3
votes
1
answer
362
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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-...
1
vote
1
answer
291
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How does the energy of a charge above a metal plate compare to two point charges?
Suppose you have the classic method of images problem. You have a point charge $q$ sitting a distance $d$ above grounded metal plate. You can then find the field as though there were 2 point charges ...
- 1,085
1
vote
1
answer
163
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How increased current carrying capacity / ampacity affects wire gauge size [closed]
In selecting a suitable wire size for manufacturing:
If I have a material that has the same resistivity and density as Copper, but has a higher current carrying capacity / ampacity for the same ...
- 11
1
vote
0
answers
2k
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What happens to metal when exposed to an electric current for an extended period of time?
I was wondering what happens to the actual metal (copper, aluminum, silver, gold) when electricity is ran through it for a long period of time. Say years like the wire in a house. Does the ...
- 11
1
vote
0
answers
52
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Strange roughness feeling on electrically ungrounded surfaces [duplicate]
When I have a device or a surface (typically metallic) that are not well connected to ground I feel a strange feeling when I pass (gently rub) my hand on them. Like the roughness of the surface is ...
- 1,334
3
votes
3
answers
2k
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When current passes through a wire, does it only travel through the outer surface?
In electrostatics we are taught that the field inside a conductor is always zero. So when current passes through a wire, the electricity only passes through the surface of the conductor.
In magnetism, ...
- 353
2
votes
1
answer
241
views
What do the batteries actually do to the electrons?
I am plagued by this simple question that what force exactly causes the motion of an electron in the middle of a lattice of electrons of a wire?
a. Is it an electric field created inside a wire due to ...
- 178
1
vote
1
answer
469
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Will putting a rubber cap on a steel bar prevent it from getting struck by lightning?
Let's say there's a stainless steel bar pointing to the sky from the ground.
Like this there's a possibility it gets struck by lightning.
Now would putting a rubber cap on top of the bar change this ...
- 113