All Questions
Tagged with electromagnetism experimental-physics
192
questions
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Disagreement between theoretical and experimental inductance of a coil
I have a coil of 20 AWG enameled copper magnet wire with approximately 270 turns: 9 layers of 30 turns. The coil is tightly packed with an overall height of about 30 mm, an overall outer diameter of ...
- 1,302
1
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1
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90
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Do twisted pair wires create a helical shaped magnetic field if parallel electrical currents are run through the two wires?
I would like to know if the shape of the magnetic field around twisted pair insulated wires will be a helical shaped magnetic field if both wires have parallel electrical current running through them.
...
- 478
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0
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25
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Hysteresis curves of a ferromagnet magnetized below saturation
I am confused about the qualitative behavior of ferromagnetic materials. Referencing the diagram below, I understand that magnetizing a ferromagnet from point A to point C (its saturation ...
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1
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26
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If we use Negative Ions as probe for nuclear reactions, will they get deflected?
I am studying the basics of Nuclear Physics, and just read about the Rutherford experiment.
My question is if we use Negative Ions as probe for nuclear reactions, will they get deflected?
If yes then ...
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1
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81
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Measurement of Electric field
I am aiming to measure the strength of an electric field at different positions in space. The electric field is generated by a coil, which is driven by an AC current. This work is based on this paper: ...
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3
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126
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Cavendish experiment and electromagnetism
Flat Earther's deny the Cavendish experiment at all costs, and it's useless to debate with them, but I learn a lot by watching the nonsense they talk about and studying it. They say that the masses ...
- 31
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1
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79
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Atoms in the cavendish torsion balance
Some people who try to deny the Cavendish Experiment say that the masses attract each other because of the atoms, not gravity. Doesn't an atom have a null electric field by nature? Is there any other ...
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2
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3k
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How can it be "unfortunate" while this is what the experiments want?
In John Gribbin's Ten Tantalizing Truths, the author discusses the cyclotron:
for a particular mass as the particles spiral outward, the rotation frequency stays constant, because the particles are ...
- 145
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48
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Do we experimentally know how a magnet reacts in a curling / non-zero-curl magnetic field?
There are two possible formulas for the magnetic force on a magnetic dipole moment due to the inhomogeneity of the magnetic field:
$$ \vec{F}_{A} = \nabla (\vec{m}\cdot\vec{B}) \qquad\text{ and }\...
- 8,660
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2
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1k
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Does the EMF of a battery change with time?
OK, so... I know that batteries provide less and less energy with time. My question is- is that a result of a decrease in the EMF of a cell or an increase in the internal resistance of the cell or ...
- 153
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2
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66
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Anisotropic Behavior of Glass in the Faraday Effect Experiment
I'm currently working on an experiment that uses the Faraday effect to determine the Verdet constant of SF-57 glass.
Basically, similar to the photo above, I have a LED that generates a 405nm light. ...
- 23
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2
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85
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Had a real experiment ever been done to demonstrate and calculate the magnetic field of a rotating charged disk? Or only thought experiments?
I have been trying to find if a real experiment has ever been done to prove and calculate the magnetic field of a rotating charged disk, whether it's a conducting or a non-conducting charged disk. All ...
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3
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3k
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The physics behind a homemade particle accelerator
I have made a particle accelerator, like the one in the following image.
homemade particle accelerator
When a metallic pellet passes through the coil, it lights up and generates a magnetic field ...
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1
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82
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Understanding the Magneto-optical trap
I am reading about this apparatus at Wikipedia: https://en.wikipedia.org/wiki/Magneto-optical_trap
And there is the following sentence which I don't understand:
"As atoms travel away from the ...
- 1,398
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2
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110
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How do scientists focus high energy electromagnetic waves onto a target?
For visible light, we are able to use mirrors to focus on what we want.
However, gamma rays' wavelengths are too short and can't see solid objects.
So how do scientists focus high-energy ...
- 625
12
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1
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246
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Weight of magnet depends on its N-S orientation?
I weighed a Neodymium disc magnet and found that it weighs about $1$ mg more when the north pole is upwards than when the south pole is upwards.
Can this be explained by "conventional" ...
- 5,925
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533
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Current through a solenoid: magnetic field gives a staircase graph
We were running current through a solenoid coil with an iron core, and measuring the resultant magnetic field strength. We expected a purely linear relation for the "current-field strength" ...
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75
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How can an experimental physicist create a free electron gas in air? [closed]
Suppose an experimental physicist has to create a free electron gas in a test chamber filled with air or any gas. They can do this with arcing, photoelectric effect, or others. What would be the best ...
- 1,896
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62
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Magnetic Suspectibility, Magnetic Field Expuslion, and Superconductors
I am reading a kit which tries to measure changes in magnetic susceptibility as a function of temperature, in the hope to capture the transition around the critical temperature. However, I am a little ...
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2
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134
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Is the spin magnetic dipole moment of the free electron not at rest the same as its rest value?
As far as I know all experiments measure the rest value of the spin magnetic dipole moment of a free electron indirectly (i.e. apparently there is yet no method or apparatus to directly measure this ...
- 4,170
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Recreating Millikan's Photoelectric Experiment
I am designing a set-up to recreate Millikan’s Photoelectric Experiment, which is similar to all the standard online simulations. I hope to achieve this without using a vacuum as it is very expensive ...
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66
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How exactly does J. J. Thompson's cathode ray experiment show that electrons are particles?
I've have heard in many places that J. J. Thompson used a magnet and capacitor plates to look at the effects of the electric and magnetic fields on the cathode ray. This way, he was able to deduce the ...
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Investigation with magnets
Take the following method for an experiment with magnets.
Method:
Hold the magnet about 1 m above the desk
Place a paperclip at the end.
Add another paperclip until the chain cannot hold any more
...
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3
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171
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What is the trajectory a hypothetical stationary electron will make inside a static magnetic field?
It is known that an electron in a magnetic field will undergo gyromagnetic rotation of its spin magnetic dipole moment around the $B$ vector of the external magnetic field.
Also in addition to the ...
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265
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What is the physical explanation of why a stationary fermion is experiencing zero force from an external static magnetic field?
Since fermions like free electrons have an intrinsic spin magnetic dipole moment shouldn't they when subjected to an external static magnetic field experience a magnetic force even assuming they are ...
- 4,170
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2
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408
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How did Maxwell Derive his equations? Can we derive the same by conducting any experiment?
$$
\begin{aligned}
\nabla \cdot \mathbf{E} &=\frac{\rho}{\varepsilon_{0}} \\
\nabla \cdot \mathbf{B} &=0 \\
\nabla \times \mathbf{E} &=-\frac{\partial \mathbf{B}}{\partial t} \\
\nabla \...
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1
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56
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Measure Position of Electron Directly
What is the most directly way to measure the position of free electron in an expirement?
I don't asking about theoretical suggestion but rather on practical expirement which people have done.
- 1,734
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1
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107
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Experimental evidence for the shape of a single electron's EM field?
I've read about how people have literally measured the gyromagnetic ratio of a single electron in a Penning trap. Naturally, I am frankly blown away by the exquisite precision of such an experiment.
...
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3
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2
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132
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How, exactly, does an electron scatter off of a neutron?
I thought about this recently because of news articles discussing the measurements of the 'neutron skin' of large nuclei....
Is it due to the fact that both have a negative magnetic moment?
Or to ...
- 4,509
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1k
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Combination of half wave plate, quarter wave plates and q-plate
I would like to understand half wave plate, quarter wave plates and q-plate. (A q-plate is an optical device which can generate light beams with orbital angular momentum of light (OAM)). Quarter-wave ...
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1
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39
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Electromagnetic induction with a two-magnet assembly
I performed a bunch of experiments where I let a two-magnet assembly free fall through a vertical solenoid. The magnets are shaped like rings, are identical in size, and are held in place - with a ...
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1
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210
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Relationship between extinction coefficient and the imaginary refraction index
I'm trying to add an ITO glass material made by SPI to an FDTD Lumerical simulation. For that I need the real and imaginary parts of the refractive index. In their website though, they give the real ...
- 113
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515
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Finding out the magnetic field at anypoint outside a permanent magnet (Cylinder,Cube)
I am working in a project where I am using different shaped permanent magnets for levitation of diamagnets. I am facing problem while calculating the magnetic field around these permanent magnets. To ...
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0
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20
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What are the basic principles of experimental electromagnetism? [closed]
I want to learn about experimental physics in the context of electrodynamics and electrostatics. Basically I'd like to know how we are able to measure different quantities in this field (electric ...
- 62
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1
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285
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How do we know that parity is conserved in electromagnetism?
Theoretically it is well established that parity is conserved in electromagnetism, that is the lagrangian is invariant under parity operation.
What I would like to know is what experiments enforce ...
- 445
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81
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What is a reference for a practical experiment for existence electric field wave and magnetic field wave in an electromagnetic wave?
Maxwell equations lead to simultaneous perpendicular oscillations of electric field as well as magnetic field with same amplitude and “wavelength”. But, they do not guarantee any propagation of these ...
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2
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100
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Inverse relationship data not producing a constant
This is a high school question, so apologies if it's dumb.
I have data from an experiment in which I placed two vertically aligned bar magnets ($N$ to $S$) at various distances, with the bottom one ...
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1
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81
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Oil-drop Experiment by Milikan: Which technique is better?
Considering the oil-drop-Experiment: Which of the following 2 techniques is more accurate:
Measuring rise and fall times.
Using (measuring) voltage while levitating and measuring fall times.
I'd say ...
- 448
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212
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How can I calculate magnetic flux density/field strength with given Force on a current carrying wire, Current and length of wire, using $F=BIL$ eq?
For my student experiment we had measured the force that magnets have on an electromagnetic copper wire with the length of 20 cm, as the current increases, the magnets push down the copper wire more ...
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0
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41
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Wave impedance experiment using a wave guide
I am conducting an experiment to reduce wave guide impedance. To do this, I have a wave guide emitting microwaves down the tube then into free space. A oscilloscope is connected to a to a standing ...
- 433
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135
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Wave impedance in a wave guide
I'm trying to get a better understanding of impedance for a wave guide. First of all, my current understanding of the topic is that its a ratio of the electric field amplitude over the magnetic field ...
- 433
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2
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493
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Paul Dirac on Dimensionless Physical Constants and $\alpha\sim\frac{1}{137}$
Paul Dirac gave his viewpoints on the dimensionless constant (click to see the youtube video). For example, he mentioned the fine structure constant
$$
\alpha\sim\frac{1}{137}.
$$
It is not clear that ...
- 4,336
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45
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Formalizing the Askar'yan Effect
Wikipedia defines the Askar'yan Effect as...
[The] Askaryan effect is the phenomenon whereby a particle traveling faster than the phase velocity of light in a dense dielectric... produces a shower of ...
- 799
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Electromagnet with a hollow core [closed]
For a project, i want an electromagnet with a hollow cylindrical space of 60mm(something Iike as shown in attached image) which can produce a force of 1000N inside this hollow space on a ferromagnetic ...
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2
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178
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Deflection angle of an alpha particle when colliding with a stationary nucleus
Is it possible to calculate the deflection angle of an alpha particle after colliding with a stationary nucleus with atomic number,Z,without actually knowing Z or for that matter without knowing the ...
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82
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What does the electric field look like emanating from a tesla coil?
The magnetic field from a wire wraps around it. The direction depends on the direction of the current. This means that the magnetic field passes through the center of the secondary coil, then out ...
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On the relationship between slit width and light diffraction
In a light diffraction experiment, using a laser and a diffraction grid we can observe that the slits produce a diffraction pattern when the light from the laser goes through it. I have the hypothesis ...
- 67
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2
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159
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How do we measure other particles that are not photons?
I believe most particle detectors are based on either the photoelectric effect, or simply on excitation of atoms by light. Then, the energy resulting from this process is converted into something we ...
- 1,056
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3
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Can a detector fail to detect a wave of electromagnetic radiation because the wave's amplitude is at or near its minimum?
If a very brief wave (perhaps a single photon, or maybe a soliton?) is at its minimum (a 'node') when it encounters a detector, would it still be detected?
- 4,509
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63
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Is it possible to compress valence electrons within a copper wire using two electric fields?
I am wondering if the free electrons within a straight copper wire could be compressed towards the center of the wire with the use of two electric fields created by two sets of parallel plates.
I ...
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