All Questions
Tagged with electromagnetism experimental-physics
192
questions
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Experiment for jammers
I'm going to grade 11 and I have to write an essay in physics. One requirement is to do an experiment which - in the best case - also includes measurements.
I would like to write about jammers, which ...
1
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0
answers
34
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Guoy method derivation, or, how not to break math?
I start from $d\vec{F}=\nabla(\vec{m}\vec{B})$, $\vec{M}=\frac{d\vec{m_i}}{dV}$, and $\vec{M}=\frac{\chi_v}{\mu_o}\vec{B}$.
I write out the definition of the force, determine we're only interested ...
- 33
4
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4
answers
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What causes the spirals to be inward in the bubble chamber images?
My understanding is that the circular paths are caused by the action of the Lorentz force on the electrons and positrons.
However, I'm not sure why the circular paths are going inward. I have two ...
- 8,660
2
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1
answer
1k
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Electromagnetic wave and skin depth, skin effect
In EM theory concept of skin depth is induced which is a measure of how much a EM wave can penetrate the medium, from it arises the concept of skin effect which is for EM wave but we use this to ...
- 366
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0
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94
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Investigating the relationship between a changing B field and the curl of the electric field induced
I am currently working on a 12 page lab report on Faraday's law, essentially investigating, how for different magnetic field strength through a stationary loop of wire with N number of turns, effects ...
- 225
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2
answers
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How do we determine that an object is neutral?
This has been bothering me for a while. Imagine that you are an experimentalist who does not have any known mass or charge to compare against. Imagine also that you do not have any idea about the ...
- 731
2
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1
answer
496
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Analytic Solutions to Magnetic Fields of Circular Current Loop
I came across an interesting problem and am wondering if there is a quick answer to it from someone who's done this before before I whip out the books of integral tables.
Analytic expressions from ...
0
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2
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94
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Why is it important to measure permittivity and permeability complex of materials?
I know that in general, $\epsilon(r,\omega)$ and $\mu(r,\omega)$ are complex tensors, so now how do you resolve maxwell equations?
I don't understand why there are techniques to measure them if you ...
- 161
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276
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Why do we believe local gauge invariance (that tells us photons are exactly massless)? [duplicate]
There are experimental upper limits on the photon's mass, but they are finite. I heard that the reason we know that photons have exactly zero rest mass (and thus travel exactly at the universal ...
- 101
2
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0
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Optimal pump wavelength for frequency doubling in periodically poled media
Background
I am currently working on achieving second harmonic generation (SHG) in periodically poled lithium niobate (PPLN) using a 1560 nm pump laser. PPLN makes use of quasi-phase-matching of the ...
- 2,333
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1
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270
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Oscilloscope measurement on primary coil changes secondary coil voltage
So I was measuring the induced voltage in a solenoid (air-core) with the primary solenoid being on the outside (parameters:$N_p=100$, $l_p=12.6cm$, $d_p=5.1 cm$, $N_s=50$, $l_s=6.3 cm$ and $d_s=3.1 cm$...
- 103
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2
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37
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How would a moving charged particle react within a parallel arrangement and conical arrangement of magnetic fields?
I am very interested in finding out how a moving charged particle would react if it were to enter into an area with parallel magnetic fields and also if it were to enter into an area with conical ...
user217618
0
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1
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171
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Can the deflection of an electron beam create a Lorentz Force capable of propelling a spacecraft?
Please reference the conceptual drawing below of this spacecraft propulsion idea. In the vacuum of outer space, if a strong electron beam enters a strong magnetic field, as shown in the drawing, it ...
user217618
5
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2
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1k
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Are there experimental observations of the Abraham-Lorentz force?
The Abraham-Lorentz force is the force a classical charged particle particle exerts on itself due to its own electromagnetic field. It has a rather simple formula that reads
$$
\vec{F}_\mathrm{AL} = \...
- 20.4k
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0
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Unequal area's under a graph of induced voltage (magnet falling through a coil) against time - Faraday's Law
I have done an experiment where a magnet was dropped through a coil of wire and the induced emf was recorded.
My understanding is that the area's under the positive and negative sections of the ...
- 123