All Questions
36
questions
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314
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Newton's third law between moving charge and stationary charge
Between two stationary charges, Newton's third law holds. But what if one of the charge is moving? Like, in moving charge, electric field is different with the field generated by stationary charge.
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- 264
0
votes
2
answers
357
views
How can Lorentz Force be defined for charges at rest as well as charges in motion?
We know that Electric field or electric force acts on charges at rest and magnetic force acts on charges in motion. But when we combine these two we get what we call as Lorentz force. So I want to ...
- 15
5
votes
3
answers
851
views
Conceptual question about special relativity in electrodynamics
I‘m currently taking Physics II and I have a conceptual question about SR in edyn.
Suppose I have two electron beams with linear charge density $\lambda$ paralell two each other in a resting system $...
1
vote
2
answers
106
views
Can a magnet deflect a static charge? If not, how do photons work?
A moving magnet is supposed to generate an electric field. That implies that a moving magnet should be able to deflect a static charge. Will the charge be deflected?
If it does not deflect a static ...
0
votes
1
answer
193
views
How did they arrive at the expression for magnetic force on a charge $q$?
I understand that the magnetic force exists as a consequence of length contraction between 2 charge carriers in a current carrying wire (wrt the frame of the moving charge); but I don't understand how ...
1
vote
1
answer
198
views
Force on a moving charge in 2 frames
The following simple problem seems to lead to a contradiction when analyzed in different frames.
Consider an infinitely long stationary wire with positive line charge density $\lambda_0$ and ...
- 33
2
votes
1
answer
589
views
Derive Lorentz Equation from Relativistic Hamilton-Jacobi Equation
Consider a ralativistic particle of rest mass $m$ and electric charge $e $ moving in electromagnetic field with four-potential ${\displaystyle A^{\mu}=(\phi ,\mathrm {A} )} $ in vacuum, then the ...
- 1,395
1
vote
4
answers
309
views
Does a moving electrically charged particle have a "magnetic charge"?
I have feeling that the force on a moving charged particle from an external field is due to the interaction of the external magnetic field with the magnetic field produced by the charged particle. I ...
- 191
0
votes
1
answer
413
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Showing the Minkowski force in the covariant form [duplicate]
So I would like to show
\begin{equation}
K^{\mu} = \frac{q}{c}F^{\mu\nu}u_{\nu} = \frac{q}{c}\left[\partial^{\mu}(A^{\nu}u_{\nu}) - \frac{dA^{\mu}}{d \tau}\right]
\end{equation}
and I went about ...
- 153
2
votes
3
answers
827
views
Using newton's third law in electromagnetism and special relativity problems
I am confused with using newton's third law in electromagnetism problems which includes Lorentz transformation.
In what conditions does this law holds?
for example, if there is an infinite charged ...
- 23
2
votes
3
answers
2k
views
Lorentz transform of force
If a particle of mass $m$ and velocity $v$ is moving due to a constant electric force what would the force be in the the frame where the particles velocity is 0?
To try and solve this I used the four ...
- 331
5
votes
1
answer
1k
views
Is it possible to express the Lorentz force in terms of differential forms?
The electromagentism can be formulated in terms of differential forms, defining de electromagnetic four-potential $A$ as a 1-form, the electromagnetic 2-form (to give it a name) $F=dA$, etc. And the ...
- 742
4
votes
4
answers
2k
views
Relativistic electromagnetism and electromagnetic forces on 2 protons
The question I have about it is how we can get the same result of net force acting on the individual protons if we judge the system from 2 different reference frames. One using more of the magnetic ...
- 1,324
2
votes
2
answers
2k
views
What is the physical meaning of the zeroth component of the Minkowski force 4-vector?
In David Griffiths' Intro to Electrodynamics, section on ED and relativity, he poses a simple problem regarding the zeroth component of the Minkowski force 4-vector for a charge $q$ moving with ...
2
votes
2
answers
164
views
What happens to forces when a charge travels at near c?
Suppose 3 electrons are travelling at $c - 1$mm at 1 cm distance
The charges are at rest relative to one another in their frame, but what happens to fundamental forces Fe and Fg? What Fe does A get ...
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