All Questions
Tagged with magnetic-fields electrons
106
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Internally, what defines whether a material is magnetically hard or soft?
I know that magnetically hard materials hold magnetic fields (magnetic moment alignment) for longer, while soft metals do not. However, what, internally, causes these properties to arise?
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How would I calculate the minimum and maximum wavelength of the Bremsstrahlung released by an electron as it goes through a magnetic field?
Say, I have an electron gun and ground below it (with a potential difference of U) and two coils side by side between them producing a relatively homogenous magnetic field B. If I shoot an electron ...
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2
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90
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Does electron moving in a circular motion inside a magnetic field experience acceleration? [closed]
I always thought that object turning means acceleration but what if an electron is caught inside a magnetic field that simply changes it path into a circular one so no electric field is allowed. The ...
- 13k
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Electron Orbit at the Null Point (DC sputter coating)
This situation pertains to 'thin film sputter coating.'
Suppose I have some magnets in between a high voltage anode and cathode in a suitable vacuum. I understand that the electrons get trapped in the ...
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178
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Units of Pauli spin magnetization and Fermi energy of free electron gas
I cannot get the correct units for the magnetic susceptibility and the Fermi energy for a free electron gas!
According to "Introduction to Solid State Physics", 8th edition by Charles Kittel,...
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Do electron spin retain its up/down direction over time?
When high speed electrons are passed through non-homogeneous magnetic field, 50% of the electron will be deflected up, and the rest 50% will be deflected down (Stern Gerlach experiment).
Suppose the ...
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89
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The magnetic dipole moment of electrons is not conserved?
The electron has a constant value of its magnetic dipole NIST. How then is "Magnetic dipole moments are neither conserved nor quantized" to be understood?
- 10.6k
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Qualitatively, how would you model the electron in a Penning trap quantum mechanically?
I know there are articles that give a full treatment of the math, but I'm more interested in the concept. I get that, in the classical picture, we are measuring the oscillation frequency of the ...
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Magnetic field by a electron
In an atom there are $n$ electrons and the $n$th electron creates a magnetic field, as it has velocity and the other $n-1$ electrons will be affected by this force. But still, why aren't we ...
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Is a moving electret considered a current, and would spinning one make a magnet?
If I establish a permanent electric charge on some volume of material (as in an electret) and then move that material through space — is that motion equivalent to a current in a wire?
Also, since a ...
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132
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Anisotropic screened Coulomb interaction for particles in a plasma
Background (isotropic screening): Consider a quasi neutral plasma. An ion/electron in a dense plasma attracts opposite-charged particles and repels
those with the same charge, thereby creating a "...
- 5,078
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244
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Electron in varying magnetic field
Lets consider an electron that is placed in an existing, constant in space near the electron, magnetic field. Electron is stationary. Magnetic field over time gradually reduces to zero.
I assume ...
- 1,116
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Why does a moving charge experience force with a bar magent unlike getting attracted or repelling to it like two bar magnets would do?
i wanted to know why does a moving charge and bar magnet not experience force similar to how two bar magnets experience since they both have magnetic fields. In bar magnets they attract or repel but ...
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169
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High speed electron and magnetic field
We know that when an electron moves at a velocity,it produces magnetic field.
My question is how strong the magnetic field will be if electron moves at a velocity $v$ or with an acceleration $a$ and ...
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43
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Force on current carrying wire due to moving charges
Consider a situation where an electron traveling at a very high velocity enters in a magnetic region created by a current carrying wire.
This means a force will act on the electron and it will deflect ...
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Is hydrogen atom with a single unpaired electron diamagnetic?
I know that paramagnetism is caused because of the net magnetic dipole moment of an atom with unpaired electrons. On the other hand, all substances exhibit diamagnetism, but the effect is weak and ...
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Would somebody feel a magnetic field if they are travelling at the same velocity as a charge?
I am little bit curious about how magnetic fields are being generated when a charge moves.
I want to check if somebody travelling along with a charged particle, would that person experience a magnetic ...
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Should electrons from the silk handkerchief align their spins when we put close a permanent magnet?
Should electrons from the silk handkerchief align their spins when we put close a permanent magnet? So to produce an extra magnetic field that will add up to the field of the magnet?
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Should electrons as tiny magnets, stick to a permanent magnet if in appropriate conditions?
Should electrons as tiny magnets, stick to a permanent magnet if in appropriate conditions? Why shouldn't the magnet collect them like tiny iron dust?I know they repeal each other but should a certain ...
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What is the atomic explanation for why some materials cannot be magnetized? [duplicate]
I have heard many variations on the explanation for why certain materials like iron can be magnetized by being stroked with a magnet, but I haven't yet found any source directly explaining why some ...
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4
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123
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Electrons, magnetism and electromagnetic waves
I know that moving charge (such as electrons moving around nuclei) produces a magnetic field. I also know that moving charge (again, such as electrons in atoms) can produce electromagnetic waves, ...
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135
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If a magnet was in a cuboid shape, would a magnetically attractive/repulsive force only be emanating from 2 of the 6 sides?
I know this is a really simplistic question, but I just want to check my assumption. Say you had a cuboid-shaped, permanent magnet, with the north pole on the side facing to the right, and the south ...
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136
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Why and how exactly do spinning electrons create a magnetic field?
I have just been told that if you had a spinning electron completely isolated, even that one electron would have a magnetic north and south pole. I have also been told that all metals have spinning ...
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Electrons crossection distribution inside a direct current wire
If electrons of a DC flow feel mutual magnetic field that should move them towards the center of the wire and in that case their accumulation in the center cause electric repulsion should there be a ...
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Direction of magnetic field in cathode ray tube experiment
In the diagram above, the S pole is pointing towards the cathode ray tube, and the magnetic field is coming out of the page causing the cathode rays to deflect upwards.
My question is, if it wasn't ...
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Is there any difference in the the electric field of a proton and an electron?
The question which I was wondering about was that how does a positive charged particle know that the other particle is positively or negatively charged? Then I thought that maybe there is some ...
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How do magnetic fields due to random motions of charges cancel out in a current-carrying wire?
In my physics textbook, it states that
magnetic fields due to random motions of charges cancel out at every point
I know there's a drift velocity due to force imposed by the electric field, but the ...
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104
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Relationship between the magnetic dipole of the electron and the polarisation of its radiation
When passing through a magnetic field, electrons are deflected sideways. This is the basis of the Lorentz force and all Hall effects. If this is done on a larger scale in particle accelerators or, in ...
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What is electron precipitation?
I'm completing a dissertation project and the only source which explains what electron precipitation actually is is linked here, from the wikipedia sources. However, when investigating the sources ...
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89
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Why is the spectrometer so big in KATRIN experiment?
I've been studying KATRIN experiment for a popularizing science project and I was wondering, why is the spectrometer so big ? I mean the thing is so huge that they had to carry it over 8000km on the ...
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Why is the speed of an electron constant in constant magnetic field?
I had known for long time that the magnetic Lorentz force $F= q \cdot (B \times v)$ acts on an electron so as to make it circle with this speed ($v$).
Recently I tried to imagine how this happens and ...
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1k
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What direction is current for an electron in both $E$ and $B$ fields?
According to Fleming's left hand rule:
I am a bit confused however in the case of an electron travelling in a region of both electric and magnetic fields, which direction would the electric current ...
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Does an electron change its energy when the spin projection is changed?
When an electron changes its spin projection in a magnetic field does it receive or take energy?
When the initial spin projection is indefinite (as is according to QM) how much is that energy?
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Why ray goes down when applied a magnetic force between it in the JJ Thompson experiment?
I have a question! I was learning about JJ Thomson's Cathode Ray Tube experiment and I understand why the ray goes up when it passes through a Wien's filter, but I cannot plenty understand why it goes ...
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Force on charged particle when moving along magnetic field lines
I was thinking, what happens to the force on a charged particle when it is moving along the magnetic field lines?
I am familiar with the right-hand-rule and it seems to me that RHR does not apply in ...
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349
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Solenoid and induced electric fields
Let us suppose there is a solenoid which has $n$ turns per unit length the current is varying with time as $I =kt$ where k is a constant if the current is flowing then there must be induced electric ...
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Why doesn't the magnetic field make electrons escape out of the material?
If a conducting rod moves within a magnetic field, the electrons within it will move for a short amount of time to create a potential difference. When the current is created within this rod, the rod ...
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Magnetic susceptibility of electron gas in non-uniform magnetic field?
Someone can explain briefly how to treat with perturbation theory a free electron gas in a sinusoidal external magnetic field ? I'm trying to understand the paramagnetic response of an electron gas to ...
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188
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Is the electron spin $g$-factor value implying the particle is a composite one?
As I understood the highest possible value for a magnetic moment of a point charge having the same amount of charge as an electron and rotating with same electron velocity and confined in the same ...
- 2,255
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3
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2k
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The motion of an electron accelerating in a uniform magnetic field
As far as I know, when electrons travel perpendicular to a uniform magnetic field, the Lorentz force makes the electron undergo circular motion. As this electron undergoes circular motion, it emits EM ...
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415
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How do magnetic dipoles align with external magnetic fields?
Based on the equation for energy of a magnetic dipole in an external field:
$$E=-\mu \cdot B$$ I would have thought that the system would minimise its potential energy and so the $\mu $ will be ...
- 1,525
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43
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Eigenstates in a 2D metal disk with finite-size perpendicular magnetic field (Piece-wise Gauge)
Let's have a two-dimensional metal disk with radius R, and now I apply a uniform magnetic field B perpendicular to the disk, within the concentric part of the disk with radius r $\lt$ R. How can we ...
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146
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Working out the radial arc of a magnetic field to get mass of electron
We have an experimental setup as below, the magnetic field strength, Bq/30s, and distances (magnet distance, Geiger counter height, Geiger to magnet centre distance) have all been recorded. The energy ...
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Electrons direction in cathode ray tube
This image below show the movement of an electron in a magnetic field, it's taken from the video [Histoire des sciences] La découverte de l'électron explaining the experience of J.J. Thompson when he ...
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The electric and magnetic field, reaching to infinity
I have difficulty’s to accept that the electric and magnetic field components of photons as well as of electrons and the other subatomic particles are extended to infinity. For practical use that does ...
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Can every mass obey the Newton's 3rd law?
As in, if we were able to produce a very huge amount of force on a very small body, would it push back with the same force? Given it doesn't break or disintegrate.
Like if we electromagnetically put ...
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456
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Electrons in an Inductor
What basically happens to the electrons, does the magnetic field produced by the electron moving in the inductor affect itself. what are the forces involved? Please elucidate the mathematics.
The ...
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What is the flux $\Phi$ enclosed by cyclotron orbit, which can express the quantization rule?
Suppose an electron (mass $m$, charge $e$) in the xy-plane with $B=(0,0,B)$ (The classical EOM result in circular orbit). Using the Bohr-Sommerfeld quantization rule we can find that $E_n = (n+1/2)\...
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An electron moving through a magnetic field [closed]
An electron, that has been accelerated from rest by a potential difference of $250\ \rm V$, enters a region of magnetic field of strength $0.12\ \rm T$. Show that speed of the electron after ...
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Do magnetic lines of force depict path of moving charges [closed]
What are the magnetic field lines basically depicting in terms of moving charges or charge carrier particles or currents.
What do those circular loops around a straight current carrying wire actually ...
