Tagged Questions
0
votes
0answers
64 views
The electric field inside a uniformly polarized cylinder
Given a uniformly polarized cylinder with some polarization $P\vec{z}$ which has radius $R \gg d$ where $d$ is the height and $R$ is the radius. The cylinder's center is on $\vec{z}$ and it's on the ...
1
vote
1answer
40 views
Why electric field outside the sphere that carries polarization is 0?
There is a sphere with radius $R$ that carries a polarization
$$\vec P(\vec{r})=k\vec r$$
$\vec r$ is the vector from the center.
I found electric field the outside generated by the sphere is $\vec ...
3
votes
1answer
76 views
Monochromatic wave
If we have an EM wave like this one:
$$E=\begin{pmatrix}1\\i\\0\end{pmatrix}e^{-i(\omega t-kz)}$$
The wave has clearly only one frequency $\omega$, but is it monochromatic? My doubt is that it's ...
1
vote
1answer
48 views
Defining a local polarization field in a distribution of charge
I am currently building a theoretical model where charges of opposite signs are created by pairs and then diffuse and are drifted by an electrical field. I am taking this along a single so far, for ...
3
votes
2answers
115 views
What is a photon's speed inside a dieletric?
We know that EM waves are slowed down in a dielectric. But at what speed does the photons that make up the wave travel?
Do they always travel at the speed $c$, but colliding/being absorbed and ...
7
votes
5answers
478 views
Why Does Light Not Become Polarized In A Magnetic and/or Electric Field?
I am familiar with the Faraday Effect, but I remain confused as to why the electric and/or magnetic components of light do not naturally align themselves with a magnetic or electric field (in a ...
3
votes
2answers
217 views
Why does the electric field dominate in light?
I read a book on the wave property of light where the author mentioned that the electric field, instead of magnetic field, dominates the light property. I don't understand why.
In Maxwell's theory, a ...
0
votes
1answer
52 views
Reason for the convention about polarization states
I'd like to know if there is a special reason for limiting convention of polarization state to waves that can be split in just two components of equal frequency.
0
votes
2answers
81 views
Is reversal of magnetic polarity in a planet an instantaneous occurence?
Just what the title states -
Does reversal of magnetic poles in a planet refer to the point in time when reversal is complete?
OR
Does it refer to the entire drawn out process (assuming the ...
1
vote
1answer
284 views
Is there orbital angular momentum for all particles?
Light as an electromagnetic wave can be polarized in different ways, e.g. linear or circular. As far as I understand it currently this can be compared to the spin direction of a propagation electron ...
1
vote
1answer
320 views
Hole in the disc shaped magnet
Let's suppose we have a magnetic disc. One half is magnetic north pole and the other half is magnetic south pole. Now suppose we drill a hole in the disc. Does anybody has an idea how the magnetic ...
5
votes
2answers
652 views
Why does it seem like a broken magnet's poles flip?
I just took a rare earth magnet out of an old hard drive. Lacking an appropriate screwdriver, force was used, and the magnet broke into two pieces; one about a quarter of the original size and one ...
2
votes
0answers
75 views
Magnetic Fields
If running a current through a magnet can reverse the magnetic field, then how strong does the current have to be and how would it best be run through the magnet.
1
vote
2answers
327 views
Laplace's equation
I have got some mathematical difficulties in the following exercise :
Calculate the potential of the polarized sphere along the z-axis. There are no free charges.
For this, we need to solve ...
