Questions tagged [electric-fields]
For questions that utilize the concept of electric fields (commonly denoted by the letter E), or for questions whose answers likely involve electric fields. More specific than the [electricity] tag, as questions about the phenomenon & theory of electricity do not necessarily involve the discussion of fields.
157 questions from the last 365 days
4
votes
1
answer
242
views
Flux through the curved surface of a hemisphere due to a dipole at its center
The dipole is placed pointing upwards perpendicular to the plane, at the center of the hemisphere, such that half the dipole is inside and half of it is outside. Essentially it means that the positive ...
6
votes
4
answers
2k
views
Is circular motion possible without centripetal force?
In this problem, the transverse voltage (according to the solution) develops because of the centripetal force experienced by electrons moving inside the resistor. The transverse electric field which ...
- 269
1
vote
2
answers
88
views
Why does the $E$ field not have the same value everywhere outside a current-carrying wire?
When discussing energy flow into a resistive wire from the Poynting vector, Purcell states that:
The current in a conducting wire is caused by a longitudinal $E$ field inside the wire; recall $J= σE$....
- 13
1
vote
3
answers
60
views
I am having doubt whether battery create internal electric field or external electric field or both
If battery generate internal electric field and exert push onto electrons and electric field in an ideal wire is approx 0 then dv/dx (change in voltage per change in distance) is 0 which is right ...
- 11
1
vote
2
answers
65
views
How is a lower voltage for dielectric capacitors communicated to charges at a distance if electric field at plates are unchanged?
This image shows a parallel-plate capacitor containing a dielectric slab that only partially fills the space between the plates, extracted from Figure 25.6.2 of Halliday & Resnick Volume Two, 12th ...
- 11
1
vote
2
answers
88
views
What are electric lines of force and the distinction between them and Flux? [duplicate]
I've been studying basic electrostatics lately and the term electric lines of force state that the lines of force are a visual tool used to represent the path traced by a charge in presence of an ...
- 11
1
vote
1
answer
81
views
Meaning Propagation of Energy and Energy per unit volume
I am a highschool student who has learnt about basics of mechanics. As I have started entering into Electrostatics and Electronmagnetic waves I am not able to comprehend the terms such as energy per ...
-1
votes
1
answer
127
views
What is an alternative name to use for the Stark effect? [closed]
The Stark effect describes the change of energy levels (or transition frequencies between atomic states) in an atom under the influence of an electric field (Wikipedia, Stark effect). While Johannes ...
- 391
2
votes
1
answer
73
views
Scaling limit of finite charged surfaces and horizontal field component on the plane
Since the previous version of this post did not receive much feedback, I would like to generalize the construction. The choice of an ellipse was motivated by the fact that it is fully solvable and ...
- 5,210
4
votes
6
answers
795
views
How is the electric field from a positive charge always positive when it has vectors that point in opposite directions?
I am studying electromagnetism in college. If I have a positive charge, we say that the electric field from that charge is positive, positive because a positive test charge is pushed away.
It seems ...
- 143
1
vote
1
answer
88
views
Null points in a system of point charges
So i got this question from another question posted on this website , in which the asker was asking if for a circle there will be infinite null points
I have a few different question
Firstly, i ...
- 69
4
votes
2
answers
634
views
What happens when an object with continuous charge distribution is placed in an electric field?
I am studying electric fields in my Physics course. We have found the electric fields of both point charges and continuous charge distributions (for points along some symmetrical axis). How I ...
- 143
0
votes
0
answers
49
views
How Transformers work in microlevel? [duplicate]
How Transformers work in microlevel. I mean how the high voltage or potential in primary side increases the flow of electron in secondary side but reducing the potential?
1
vote
1
answer
300
views
What's the electric flux through the base of a uniformly charged hemisphere due to its own electric field?
How do I calculate the electric flux through the base (the flat circular face) of a uniformly charged hemisphere due to the field created by it?
The base itself is uncharged; charge is present only on ...
- 29
1
vote
2
answers
140
views
Positive and negative traveling waves
In a transmission line or resonant cavity, the model indicates two distinct waves, simultaneously traveling in opposite directions, denoted + and -. Are we to believe these really are physically ...
- 647