All Questions
Tagged with locality electromagnetism
12
questions
-3
votes
0
answers
70
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Please tell me about "Action at a distance" in Electrodynamics [closed]
I am confused about how test charge informed about source charge. So I research on it. Web said me that it is "Action at a distance phenomenon". What is this? I am a first year Undergraduate ...
5
votes
1
answer
125
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Conserved charge at null infinity associated with Large gauge transformation
I am reading Strominger's lecture notes "Lectures on the infrared structure of gravity and gauge theory" (https://arxiv.org/abs/1703.05448). At some point, following (I guess) the authors of ...
- 3,992
0
votes
1
answer
159
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How come subatomic particles interact with each other while not being in contact? [closed]
Although electrons stays away from protons an atom remains electrically neutral
But two atoms one positively charged and another negatively charged remain so until they comes in contact.
Can the ...
2
votes
2
answers
292
views
How Maxwell theory of electromagnetism solved action at a distance problem?
According to wikipedia Maxwell's equations were an essential inspiration for Einstein's development of special relativity. Possibly the most important aspect was their denial of instantaneous action ...
- 21
3
votes
2
answers
192
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Physics solely in terms of local observables
Practically all of the physics equations I've encountered are written in terms of what might be called "remote observables", such as the distances between objects in Euclidean space or between events ...
- 24.8k
6
votes
1
answer
334
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Locality in the coulomb gauge of classical electrodynamics
In the coulomb gauge, the equations that describe the dynamics of $\Phi$ and $\vec{A}$ simplify to:
$$
\Delta \Phi = - \frac{\rho}{\epsilon_0} \\
\Delta \vec{A} - \frac{\partial_t^2}{c^2} \vec{A} = - \...
- 6,763
1
vote
3
answers
1k
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Are fields (electric or magnetic) real? [closed]
Are fields (electric or magnetic) real or they are just theoretical concepts to explain lot of stuff which couldn't be explained by Newtonian action at a distance approach?
- 1,481
2
votes
1
answer
991
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Vector Potential Oscillating E Field of the "Null" Field of a Hertzian Dipole?
The vector potential of a Hertzian dipole falls off spherically as $1/r$. The polar axis of the dipole is a "Null" field -- meaning no electric and magnetic field. The absence of magnetic field is ...
- 1,357
11
votes
4
answers
3k
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Do electrostatic fields really obey "action at a distance"?
In an electromagnetic theory class, my professor introduced the concept of "action at a distance in physics".
He said that:
If two charges are at some very large distance, and if any one of the ...
- 245
1
vote
2
answers
228
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Principle of locality and forces
I have a silly confusion about the statement written in the link Einstein and Locality
''external influence on A has no direct influence on B; this is known as the Principle of Local Action.''
...
- 1,125
3
votes
5
answers
4k
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What was wrong with action a distance?
It is usually said that the idea of fields was introduced (electric and magnetic fields) in electricity and magnetism after Coulomb's law to cure the conceptual problems of action at a distance.
...
- 17.1k
2
votes
1
answer
705
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What would it take for a physical phenomenon to be telekinetic?
I've just watched an episode by MinutePhysics called "Real World Telekinesis". In it, Neil Turok (I wonder if that is his actual name; I remember playing a game called "Turok: Dinosaur Hunter" on ...
- 319