All Questions
16
questions
2
votes
4
answers
546
views
Faraday's Law - recursive?
So we know that the EMF is induced by change of flux. The thing that was always confusing me is the following:
we start changing the magnetic field
which in turn induces electric field which makes ...
- 21
1
vote
2
answers
135
views
Radio Waves and the Lorentz Force?
Is the Lorentz Force involved when the EM wave intersects the receiving antenna? I.e. induces EMF on electrons in the antenna conductor?
I use the RHR with index finger $\vec v$ pointing in the ...
- 245
1
vote
1
answer
286
views
Can electromagnetic field(EMF) meter used to detect electromagnetic pulse(EMP)?
In theory,can electromagnetic field(EMF) meter used to detect electromagnetic pulse(EMP)?
- 127
1
vote
0
answers
33
views
What is the reletive permeability of structual steel?
Help, i need to know what the reletive permeability is of a few materials (listed below) but i can not find the data on the internet. Does annybody know the data or where i can find it?
-s235jr
-...
- 11
1
vote
1
answer
92
views
How to reduce magnetic field between two magnetic shield sheets (silicon steel sheets)?
I put 2 parallel silicon steel sheets between magnetic field as below:
As silicon steel has much bigger permeability than air,magnetic line will go through 2 silicon steel sheets.
What I can do to ...
- 127
1
vote
0
answers
24
views
Is Ampere's law or Fraday's Law reversible for AC currents?
In other words, if a time varying magnetic field induce a amount of voltage/current into a coiled wire, would generate the coiled wire that is loaded with the measured/calculated amount of induced ...
- 11
0
votes
5
answers
188
views
Is it right to say that magnetic field energy is created only by non-conservative electric field?
In all the examples of generation or existence of Magnetic Field energy I have seen so far, I couldn't find any example, where magnetic field energy is created without Non Conservative Electric field, ...
- 2,517
0
votes
5
answers
513
views
Total Energy of an electromagnetic wave
This question may sound stupid. But why when we calculate the total energy density (energy/volume), carried by an electromagnetic wave $u_T$, we add both $u_B$ + $u_E$.
Where $u_B = \frac{B^2}{2\mu_0}...
- 170
0
votes
1
answer
101
views
Do magnetic fields really travel with ${}c$ velocity in space?
I was thinking about a situation: In space there is our setup, a wood piece of mass $m$ and a coil and permanent magnet of mass $m$. The coil is placed a light second far from the magnet. The magnet ...
0
votes
1
answer
52
views
Why is energy in magnetic field dependent upon frame since field is a physical quantity (wave)?
Why does energy in magnetic field change with changing frame. I mean magnetic fields are physical things that are released by source charge. So how can the energy released by a source charge change ...
0
votes
1
answer
89
views
If magnetic fields do not have any energy in them then, how could they work on charge?
We know that a magnetic field which is changing and is perpendicular to the velocity of charge $q1$ will create an Electric field which acts upon that $q1$ and does some work. Here the work is being ...
user316791
0
votes
1
answer
62
views
Why moving magnet releases more Magnetic radiation as the number of charges near it are increased?
Why does a moving (at constant velocity) magnet release more energy in the form of magnetic fields when the number of charges placed near it are increased?
Say two current carrying coils $C1$ and $C2$ ...
0
votes
1
answer
96
views
Time to magnetize iron
How long does it take for the magnetic domains of a piece of iron to align (and form a magnetic field) from the moment it enters in contact with a magnetic field?
- 119
0
votes
1
answer
108
views
Understanding the physics of inductors
If an inductor "stores energy in a magnetic field", what does that mean exactly? It sounds like there's an invisible force field emanating from the coil or orbiting around the wire. As if electrons ...
- 179
0
votes
1
answer
87
views
Does resonant inductive coupling work in the presence of a strong magnetic field?
Does resonant inductive coupling work in the presence of a strong magnetic field? I am unsure because resonant inductive coupling uses magnetic fields to transmit power wirelessly and a strong ...
- 125