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Results tagged with electromagnetism
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user 264639
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.
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votes
Is there an answer to why a charge placed next to a current carrying conductor only experien...
This is an observational fact. The theory was crafted to match this and other observations. The math doesn't really explain anything.
But I think the misconception in your model is "As we have negativ …
- 21.9k
2
votes
Accepted
Why have a resistor in the secondary winding of a transformer?
The pedagogical purpose of a resistor connected to the transformer secondary is to elucidate the voltage and current transfer properties of the transformer from primary to secondary. Without the resis …
- 21.9k
1
vote
How can visible light penetrate dozens if not hundreds of meters deep when it's skin depth i...
The skin depth model doesn't apply when the conduction is limited by the inertia of the conducting charges rather than by the resistivity of the medium. At optical frequencies, the ions that give seaw …
- 21.9k
0
votes
How is oscillation of EM waves determined in cases that don't involve accelerating charges i...
Mathematically, any function may be decomposed into periodic sinusoids via Fourier analysis. What we observe in nature corresponds to this math. A prism will separate light into colors representing th …
- 21.9k
1
vote
How to achieve a strong attraction of an electromagnet?
About the only way is to make the magnet big. Outside the immediate vicinity of the magnet, the field falls at least as fast as $r^{-3}$.
- 21.9k
0
votes
How is energy conserved in electrical circuits without considering the energy stored in the ...
Leave out the resistor, just connect a loop of wire to the battery (assumed to be perfectly conductive). That loop has an inductance. Even though there's no resistance, there isn't infinite current. I …
- 21.9k
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vote
How do CDs and similar devices nullify the color of the light shined on it?
Whenever you have destructive interference like this, you have constructive interference in a different direction. So, the electromagnetic energy doesn't reach the detector, but goes elsewhere. I'm no …
- 21.9k
2
votes
Free electron absorbing energy from electromagnetic radiation: Classical and Quantum pictures
We draw a distinction between absorption and scattering. Classically, if you illuminate an isolated electron with an electromagnetic wave, it oscillates. An oscillating electron radiates electromagnet …
- 21.9k
4
votes
How can the given formula yield a frequency, when it doesn't have a parameter with time units?
Your formula is in Gaussian Units, where charge has the dimensions g^(1/2) cm^(3/2) s^(−1).
- 21.9k
2
votes
Accepted
Do Eddy Currents lead to greater heat generation in better conductors or insulators?
Both are correct. There are no eddy currents in perfect insulators, while the surface current in a perfect conductor dissipates no energy.
There is energy dissipated at intermediate conductivity. How …
- 21.9k
5
votes
Can you make electromagnets with conductive plasma?
Plasma current provides the poloidal field component in a tokamak.
A magnetic field produced by the current through a plasma pinches the flame, producing the sound of a flame loudspeaker. Made one of …
- 21.9k
-1
votes
Considering EM radiation as waves, how many particles can interact with one "ripple"?
You might look at Thomson scattering, the classical interaction of an electromagnetic wave with a single charged particle.
Response to comment:
Trying to understand the collective interaction of a bun …
- 21.9k
1
vote
Does direct current exist in an infinite straight thin wire?
Mathematically, the electromagnetic energy per unit length is divergent for an infinite wire supporting a finite electromagnetic field. The characteristic impedance is infinite. Thus, in principle, yo …
- 21.9k
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Why is calculating the resulting field from polarization not recursive?
When puzzling over problems like this, you should always consider how you would do the experiment. Here, the dielectric constant is a parameter you measure by making a capacitor and determining the po …
- 21.9k
2
votes
How can the electric and magnetic fields be non-zero in the absence of sources?
This is an example of the math not fully capturing the physics. What we observe in reality is that every EM field in the universe has a source somewhere. The source may be a long way from where we det …
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