Perhaps we should take a break from all the higher theories of the Universe for now.
Its years since I battled away with Maxwell's equations, but something entirely surprising comes out of them.
You don't often encounter Relativity in normal life, except that magnetism is entirely a result of relativity.
It is caused by moving electrons in the wire being foreshortened by relativity. Not many people know that.
Its years since I battled away with Maxwell's equations, but something entirely surprising comes out of them.
You don't often encounter Relativity in normal life, except that magnetism is entirely a result of relativity.
It is caused by moving electrons in the wire being foreshortened by relativity. Not many people know that.
So how does this explain the phenomenon where by which a continual flow of virtual photons complete a cycle through a horseshoe shaped ferrite metal bar with another straight shorting bar across the ends held there magnetically but perpetually until the shorting bar is forced off, being that neither of which are permanent magnets?
Last edited:
Current carrying electrons in a wire do not move at relativistic speeds, but at a mere snails pace.
The Lorentz factor (gamma) hardly differs from 1 so the distance contraction is exceedingly tiny.
One would wonder how we can measure magnetic forces at all.
The Lorentz factor (gamma) hardly differs from 1 so the distance contraction is exceedingly tiny.
An externally hosted image should be here but it was not working when we last tested it.
One would wonder how we can measure magnetic forces at all.
When dealing with electric and magnetic forces, even the infinitesimally small length contraction of the electrons at these drift speeds leads to relativistic effects.
The length contraction leads to a minute change in charge density which has an appreciable relativistic effect when we consider that the total charge of all the conduction electrons in a metre long wire is tens of thousands of coulombs.
The length contraction leads to a minute change in charge density which has an appreciable relativistic effect when we consider that the total charge of all the conduction electrons in a metre long wire is tens of thousands of coulombs.
A practically endless number of pages of description are out there. Just Giggle 'magnetism and relativity'.
e.g. Q & A: magnetism and relativity | Department of Physics | University of Illinois at Urbana-Champaign
e.g. Q & A: magnetism and relativity | Department of Physics | University of Illinois at Urbana-Champaign
Nor I!
I was quite happy to accept that magnetism is a force produced by moving electric charges or which arises as a consequence of a moving charge's interaction with that invention we call the magnetic field.
However, neither description actually explains magnetism. Enter relativity!
My computer is restored by a new power supply, so can give you a link if you doubt that Maxwell's 4 Equations can't be reduced to one:
Mathematical descriptions of the electromagnetic field - Wikipedia
Uses slightly abstract current density J and Force F one formulation. Just a change of variables really.
I just looked up my College Undegraduate Physics courses to see if I know anything about this.
M211 Vector Algebra 1/4 unit
PH253 Electromagnetism, Optics and Spectroscopy 1/2 unit
PH327 Communication Electronics and Magnetic Resonance 1/2 unit
PH247 Second Year Physical Laboratory 1/4 unit
Always liked the old electricity. It's very powerful stuff, just you don't usually notice because it's mostly balanced out. Nothing gave me more entertainment than Million Volt sparks. You could punch holes in cardboard with the 4" sparks. The distinct smell of Ozone like Lightning storms..
Just keep the little fingers away. One of our lecturers had lost all his hair after a severe electric shock.
Should have been more careful, IMO. It can be a bit SUDDEN! And it's a bit unpredictable where it is going to go. The trick is to guess the Earth path.
Mathematical descriptions of the electromagnetic field - Wikipedia
Uses slightly abstract current density J and Force F one formulation. Just a change of variables really.
I just looked up my College Undegraduate Physics courses to see if I know anything about this.
M211 Vector Algebra 1/4 unit
PH253 Electromagnetism, Optics and Spectroscopy 1/2 unit
PH327 Communication Electronics and Magnetic Resonance 1/2 unit
PH247 Second Year Physical Laboratory 1/4 unit
Always liked the old electricity. It's very powerful stuff, just you don't usually notice because it's mostly balanced out. Nothing gave me more entertainment than Million Volt sparks. You could punch holes in cardboard with the 4" sparks. The distinct smell of Ozone like Lightning storms..
Just keep the little fingers away. One of our lecturers had lost all his hair after a severe electric shock.
Should have been more careful, IMO. It can be a bit SUDDEN! And it's a bit unpredictable where it is going to go. The trick is to guess the Earth path.
Last edited:
- Status
- Not open for further replies.