All Questions
16
questions
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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
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- 11
1
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2
answers
132
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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
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1
answer
91
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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
0
votes
1
answer
81
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Magnetic flux through a closed surface
I was reading Electromagnetic Induction, then I faced a understanding problem while reading the integral and differential form of Faraday's Law..
We know Magnetic Flux= ${\bf B} \cdot {\bf S}$
Where ${...
0
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5
answers
509
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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
1
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0
answers
24
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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
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1
answer
51
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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
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1
answer
88
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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
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votes
1
answer
62
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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 $C2$ ...
1
vote
1
answer
282
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
0
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1
answer
101
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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
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1
answer
94
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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
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1
answer
107
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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
5
answers
188
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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
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1
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87
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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