Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with electromagnetism
Search options not deleted
user 36793
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
1
vote
3
answers
783
views
Is this case a failure of Stokes' theorem?
In the presence of a hypothetical magnetic point charge at the origin of coordinates, it turns out that an irremovable physical singularity of the vector potential ${\bf A}({\bf r})$ exists for any ch …
- 27.2k
1
vote
1
answer
57
views
What could be and how to come up with a mathematical formula for the local electric field in...
I asked a similar question here more than two years ago. I did not get an answer to my complete satisfaction. I would like to reiterate the problem again.
The local electric field of a monochromatic r …
- 27.2k
2
votes
3
answers
99
views
Is the time evolution of physical fields unambiguous without fixing a gauge?
Context The origin of the question below stems from this lecture here by Raman Sundrum between $48.20$ to $51$ minutes.
Let at some initial instant $t_0$, the electric and magnetic fields (E and B) …
- 27.2k
1
vote
How is Meissner effect consistent with the frozen field lines inside the superconductor?
And in fact, it is possible to lock magnetic field lines inside a superconductor if the magnetic field were applied before the material was cooled below $T_c$. This seems to suggest $B\neq 0$ insid …
- 27.2k
1
vote
1
answer
263
views
For the free electromagnetic field, is it possible make single gauge transformation to achie...
For any electromagnetic field, it is easy to impose the Coulomb gauge condition ${\bf\nabla}\cdot{\bf A}=0$. To start with, if ${\bf \nabla}\cdot{\bf A}_{\rm old}\neq 0$, the trick is to make a gauge …
- 27.2k
0
votes
1
answer
79
views
Reviewing an old argument about the number of DOFs of EM field
For free electromagnetic fields, it is possible to choose a gauge such that the scalar potential $\phi(t,{\bf x})=0$ and the vector potential ${\bf A}(t,{\bf x})$ satisfies the Coulomb gauge condition …
- 27.2k
8
votes
3
answers
938
views
How do Maxwell's equations uniquely determine ${\bf E}$ and ${\bf B}$ despite no. of equatio...
Maxwell's equations in free space are given by $${\bf\nabla}\cdot\textbf{E}=0,~~{\bf\nabla}\cdot\textbf{B}=0$$
and
$${\bf\nabla}\times\textbf{E}=-\frac{\partial\textbf{B}}{\partial t},~~{\bf\nabla}\ti …
- 27.2k
2
votes
Accepted
How can we do this tensor product $F_{\mu \nu}F^{\mu \nu}$?
Expand $F_{\mu\nu}$ and $F^{\mu\nu}$ and multiply. Since $\mu,\nu$ are summed over, in the next step, they can be interchanged so that $$(\partial_\mu A_\nu)(\partial^\mu A^\nu)=(\partial_\nu A_\mu)(\ …
- 27.2k
2
votes
Accepted
Electric field lines and coordinates
The electric field $\textbf{E}_{\rm point}$ due to a point charge is spherically symmetric i.e. it does only depend upon how far you are from that charge. Such force fields are called central force fi …
- 27.2k
2
votes
4
answers
404
views
What causes $A^{\mu\nu}_{\pm}=F^{\mu\nu}\pm i \tilde{F}^{\mu\nu}$ to have three independent ...
Both the elctromagnetic field strength tensor $F^{\mu\nu}$ and its dual $\tilde{F}^{\mu\nu}$ defined as $\tilde{F}^{\mu\nu}=\frac{1}{2}\epsilon^{\mu\nu\lambda\rho}F_{\lambda\rho}$ are examples of anti …
- 27.2k
0
votes
2
answers
389
views
Deviation from Linear response in metals and Ohm's law
In metals, Ohm's law is an example of a linear response i.e., $I\propto V$ where $I$ is the current (response) due to the applied voltage $V$ (external force). For metals, can we have a breakdown of l …
- 27.2k
2
votes
1
answer
2k
views
Parity transformation property of $\epsilon^{\mu\nu\sigma\rho}$ and $F_{\mu\nu}$ (and $G_{\m...
The Lorentz invariant term $\epsilon^{\mu\nu\sigma\rho}F_{\mu\nu}F_{\sigma\rho}$ is not parity invariant. To show this one needs to find the parity transformation property of $F_{\mu\nu}=\partial_\mu …
- 27.2k
0
votes
What would happen to the transverse nature of EM field if photon had a mass?
This is what happens for a Proca field. The corresponding "electric field" will not remain divergenceless i.e., $\boldsymbol{\nabla}\cdot\textbf{E}\neq 0$ but the corresonding "magnetic field" will re …
- 27.2k
1
vote
2
answers
2k
views
Why does hysteresis occur?
The existence of domains is a necessary condition for ferromagnetic materials to exhibit the phenomenon of hysteresis. But how are domains responsible for the phenomenon of hysteresis? What is the und …
- 27.2k
2
votes
2
answers
257
views
Physical implication of $\textbf{E}\rightarrow\textbf{B},~~\textbf{B}\rightarrow -\textbf{E}...
An interesting observation to consider about the Maxwell's equation is that in absence of the sources, the equations are symmetric under the interchange $$\textbf{E}\rightarrow\textbf{B},~~\textbf{B}\ …
- 27.2k