All Questions
16
questions
4
votes
6
answers
2k
views
Electric current definition
I'm trying to understand electric current. Some resources say that it is the flow of charge, and other resources say that it is the quantity of charge that passes through a cross-sectional area over a ...
0
votes
1
answer
82
views
Does making a conductor spiky increase its capacitance?
I'm thinking of the proofs for "charge accumulation at the points of a spiky conductor" e.g. https://www.feynmanlectures.caltech.edu/II_06.html 6-11
If charge accumulates at sharp edges, I'm ...
- 446
3
votes
1
answer
690
views
Does the shape of a wire affect the electric current in it in any way?
Say we have a straight wire connected across two terminals carrying electricity between them. If everything is kept the same (voltage across the two terminals, resistance of the wire, etc.) will there ...
- 195
5
votes
4
answers
977
views
If an electron is repelled by another electron how is it that we get an electric current?
As we know that an electric current is a flow of electric charge in a circuit, and in electric circuits, the charge carriers are often electrons moving through a wire.
Now, since we know that like ...
2
votes
1
answer
199
views
When you introduce excess charge into an insulator the charge stays still. Why is this?
When you add charge to an insulator the electrons stay in the same place whereas in a conductor they spread apart. Why is this? What force is making the excess charge stay in one place in an insulator?...
- 143
0
votes
0
answers
26
views
What causes the charges in conductor to move towards lower potential terminal of cell [duplicate]
Whenever a conductor is connected to a cell,what causes the conventional positivecharges inside it to move towards the lower potential level of cell..
My question is whether the charges experience a ...
- 31
1
vote
1
answer
53
views
Is it necessary that a capacitor stores charge?
Is it necessary that a capacitor storage charge? I am a little bit confused.
For example: if I take two concentric conducting shells and a positive point charge at the centre. Both the surfaces (outer ...
- 99
1
vote
1
answer
565
views
Can a conductor be uniformly charged?
I have been reading in books that charges on a conductor resides on its surface and that for a body to be uniformly charged it has to be an insulator.Is it true?If yes does it mean we can consider a ...
-1
votes
1
answer
66
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?
- 1,648
0
votes
1
answer
2k
views
Charge accumulation in wire
I came across a question about charge accumulation. It states that if a steady current flows in a wire composed of a copper and iron wire of same area (see fig), will the charge accumulate on the ...
- 143
1
vote
1
answer
49
views
Electric charges
It is known that why we see a small bit of lightning or an electrostatic shock is when placing a negatively charged conductor to a neutral conductor, isn't it?
My question is why do feel hurt or ...
- 99
4
votes
3
answers
1k
views
Why do we get electric shocks when most structures are insulators?
Suppose I was standing in the sea, and touched an electric fence; I would receive an electric shock, because both my body and the sea are conductors, and create a path for the electricity to flow. The ...
- 2,943
3
votes
1
answer
3k
views
Energy Loss during Sharing of Charge between two Capacitors
It is fairly easy to show that there is always a loss energy when two capacitors share their charge to attain the same common potential, but is it with the same ease that one can explain why it ...
- 380
0
votes
1
answer
596
views
In Leyden Jars, how does the outer metal get charged?
In a Leyden jar, I have read that a charged object is brought in contact with the conductor in contact with the metal inside the jar, thus giving the inner metal a similar charge. And the metal ...
- 631
0
votes
5
answers
29k
views
Why don't the positive charges in a conductor move?
Charge is carried by electrons moving. The protons are always stationary.
The answer I found online is the protons are stuck in the nucleus so they can't move ("strong nuclear force"). But why can't ...
- 2,009