(February 2, 2022 at 9:22 am)polymath257 Wrote:(February 1, 2022 at 4:33 pm)Ferrocyanide Wrote: I guess you deleted a quote tag and the formatting is messed up. The forum software should not allow an unpaired quote tag.
I think I understand. A neutron has 2 poles, sort of like a bar magnetic.
Aren't electrons and protons dipoles as well?
No. Electrons are electric monopoles and have no magnetic moment at all.
Quote:But the shape of the magnetic field around a beam of electrons/proton is circular and perpendicular. So, it is possible to use a uniform magnetic field to exert a force on a beam of electron/proton.
Source:
http://hyperphysics.phy-astr.gsu.edu/hba...agcur.html
Yes. The 'shape' of the magnetic field around any current is circular around the direction of the current.
And, yes, a magnetic field produces a force on a moving charge. But this is NOT due to the interaction of the magnetic fields. It is a direct action of the magnetic field on a moving charge. Look up the Lorentz force law.
Quote:So, perhaps, that is the shape of the magnetic field around each individual electron.
This would also mean that one electron pushes on another electron because of the individual magnetic field and their individual charge. So a beam of eletron always diverges.
A beam of electrons will diverge because of the *electric* force being repulsive between two like charges. That is NOT due to any magnetic field.
I ran into this interesting article.
Source:
https://sitn.hms.harvard.edu/flash/2018/...particles/
There is also this
Source:
https://en.wikipedia.org/wiki/Electron_magnetic_moment
Quote:The electron is a charged particle with charge −1e, where e in this context is the unit of elementary charge. Its angular momentum comes from two types of rotation: spin and orbital motion. From classical electrodynamics, a rotating electrically charged body creates a magnetic dipole with magnetic poles of equal magnitude but opposite polarity. This analogy does hold, since an electron indeed behaves like a tiny bar magnet. One consequence is that an external magnetic field exerts a torque on the electron magnetic moment depending on its orientation with respect to the field.
But besides that magnetic moment caused by spin, I think a stationary electron or an electron that is moving at the same velocity as a detector is said to NOT have a magnetic field.
So, a magnetic field is a relative thing.
If we have a stationary detector and a current is going through a wire (or vacuum), then we can detect a magnetic field that is circular around the wire (perpendicular to the wire direction).
The magnetic field becomes detectable since the detector and electrons are NOT moving at the same velocity.
The Lorentz force law seems to be for such cases, where the particle itself doesn’t have a magnetic field.
This creates an interesting situation. If I draw a cross on the ground.
If I number the end points of the cross as 1, 2, 3, 4.
If I place a stationary electron at the center of the cross.
If I move my detector from point 1 to 3, I would detect a circular magnetic field perpendicular to line segment 1..3
If I move my detector from point 2 to 4, I would detect a circular magnetic field perpendicular to line segment 2..4
What if I have 2 detectors and I move one from 1 to 3 and the other from 2 to 4.
Each detector would detect a completely different magnetic field.
I don’t know if I was clear enough.