All Questions
54
questions
0
votes
2
answers
204
views
Do surfaces charge distribution in a wire move?
Upon reading matter and interactions ,In the chapter "electric field in a circuit" and surface charge distributions in a steady current, The book dosen't explain why doesn't the surface charges move ...
- 323
0
votes
2
answers
54
views
Current law explained
Kirchhoff's Current Law (KCL) is experimentally proven but what exactly happens?. I have made a model by taking the drude model and adding the interactions between the electrons and the reason why ...
- 49
0
votes
1
answer
76
views
Resistance and temperature relationship
When the temperature changes from $\theta_1$ to $\theta_2$, having $\alpha$, and the amount of resistance ($R_1$) in the previous temperature ($\theta_1$), we can calculate $R_2$, the amount of ...
- 1
0
votes
3
answers
133
views
Flow of charges inside a battery
I am having confusion about the flow of charges inside a battery which is connected to Circuit.
Question is, do charges move from one end to another through the battery? If yes, how? Do they move ...
- 11
1
vote
1
answer
1k
views
Two types of electric field
My textbook mentions that electric field produced by electric charge and that produced by changing magnetic field are different in nature.
After searching from various sources I found that electric ...
- 135
1
vote
1
answer
655
views
When DC current flows through salty water, how does the current flow? How can you tune the (narowness of) the path?
Consider this very simple and well-known experiment with dirty/salty water:
The light bulb turns on, and current is flowing. How can you know how this current is exactly flowing, and how the electric ...
- 1,063
1
vote
2
answers
153
views
Creation of electric field inside a conductor
My book says that as soon as the two ends of a conducting wire touches the two terminals of a battery, it generates an electric field inside the conductor. Why?
- 31
1
vote
1
answer
478
views
In the photoelectric effect experiment of stopping voltage, why isn't there a buildup of negative and positive charge on each side of the circuit?
Given this schematic, and that there is an electric field in the downwards direction due to the power supply, when the photon hits the emitter plate, the electrons leave the upper plate and hit the ...
- 11
1
vote
1
answer
7k
views
Why is the drift velocity directly proportional to the electric field?
If I double the electric field, that should double the acceleration of electrons inside the conductor in the general direction of the electric field. But why does that double the drift velocity, and ...
- 3,075
1
vote
2
answers
73
views
Current in a circuit
I know that to have a current in a circuit we need a potential difference that creates a gradient that makes electrons move from low potential to high potential. My question is that how, in a circuit, ...
- 330
1
vote
2
answers
1k
views
How does the electric field produced by a battery get transferred along a relatively long wire connecting the ends of the battery together?
My understanding of how the electric field produced by a battery gets transferred along the length of the wire is summarised in the following picture:
Is it correct to say that the force that the ...
- 169
0
votes
2
answers
800
views
Does the electric field strength along a simple circuit depend on the resistance of the conducting wire along its length?
A few hours ago I asked, if the electric field produced along and through a wire connected across the ends of a battery (a shorted out circuit) was uniform. The answer I was given was yes. But what if ...
- 169
0
votes
1
answer
84
views
how come electric field is o but current is there? [duplicate]
If electric field inside a conductor is zero then why is there an electric current in a resistor when an emf is applied across it for a long time?
- 595
0
votes
3
answers
64
views
What is the minimum safe distance a human finger can be placed away from a live contact of 16A, 250V? [closed]
what is the minimum safe distance a human finger can be placed away from a live contact of 16A, 250V and not get shock. Would this distance change if the air was humid?
Would this distance change if ...
0
votes
1
answer
663
views
Current and Ohm's Law in Motional EMF examples
Question:
What causes the current to flow through the whole circuit in the given example? I understand that on the disk there is an emf (integral of force per unit charge) from the centre of the ...
- 1,023