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Apr
15
comment Why does Einstein say contradictions arise from treating the EM field as lines of force?
@WetSavannaAnimalakaRodVance I can remember reading Feynman somewhere giving a similar argument: The model of magnetic field lines as being gears and cogs, stresses etc in the medium in one frame, but then disappearing in another frame.
Apr
14
answered Why does Einstein say contradictions arise from treating the EM field as lines of force?
Apr
6
comment Is there an analogue of a geodesic for the evolution of the electromagnetic field?
What about using the proper time of the center of electromagnetic momentum frame?
Mar
10
accepted How does isotropy of free space imply $L(v^2)$ for a free particle?
Mar
10
asked How does isotropy of free space imply $L(v^2)$ for a free particle?
Jan
16
awarded  Yearling
Dec
13
answered Relationship between mass preserving four-fources and proper acceleration
Dec
5
awarded  Popular Question
Sep
20
answered Why isn't the product rule used in the definition of mechanical work?
Sep
20
answered Moving the plates of a charged capacitor to calculate energy density - where's the flaw in my argument?
Sep
7
revised There is no such thing as magnetism?
Add images to improve clarity
Aug
30
revised There is no such thing as magnetism?
added 51 characters in body
Aug
30
revised There is no such thing as magnetism?
improved clarity
Aug
30
revised There is no such thing as magnetism?
improved clarity
Aug
30
answered There is no such thing as magnetism?
Aug
29
comment No magnetic field from a static charge - Is there a simple physical argument to show why?
The forces are assumed to be general (electric + magnetic + other) and symmetrical to one another in the COM frame, and this limits the type of force experienced by a charge in the rest frame of the other. As a guess, it means it can't be velocity dependent and therefore can only be electric. Maybe the direction of the acceleration is limited in some way?
Aug
29
comment No magnetic field from a static charge - Is there a simple physical argument to show why?
Thanks, I guess Maxwell's equations says so and that's it really. I still think there's a possible simple argument though: boosting to the COM frame of two charges moving at identical velocities towards one another, and looking at the forces which should be identical.
Aug
27
comment Special Relativity and Constant Acceleration
don't forget to add an upvote to Josh's correct answer
Aug
27
comment Special Relativity and Constant Acceleration
The question only asked for clarification on the time dilation, so on second thoughts my suggestion unnecessarily complicate things. I was thinking that $dv/dt = \gamma^3dv'/dt'$. The question says the proper acceleration is constant so $dt = dv/(a'\gamma^3)$ giving an integral you can evaluate in terms of the start and final velocities.
Aug
26
comment Special Relativity and Constant Acceleration
The integral could do with a change of variable since $\gamma$ is a function of $v$