All Questions
25 questions
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645
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Thought experiment and possible contradiction between electromagnetism and special relativity (Part II)
A new thought experiment has recently crossed my mind to which I could not find a clear solution as yet. Assume that an observer $B$, holding a magnet, moves inside an electric field of $E_y$ at $v$ ...
- 2,774
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1
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77
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What happens when both magnetic field and electric field is applied to a charged particle?
Now what exactly happens when magnetic field and electric field is applied perpendicularly? What happens when they are not perpendicular?
In the question, it says that a magnetic field and electric ...
- 91
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votes
1
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131
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A question about Coulomb's law for one moving and one stationary charge
let one charge is moving and another charge is stationary (compulsory). Then the electric force between them can be calculated by coulomb's law?
- 107
1
vote
1
answer
97
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The force experienced on a charge, using macroscopic quantities
Zangwill says (Zangwill, Modern Electrodynamics, 2012 edition, page 40, undersection 2.3.1, "Lorentz Averaging")
...An example is the force on the charge density $\rho$ and current
density $...
- 702
1
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1
answer
210
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Ratio between electric and magnetic forces
Suppose I have two beams of electrons moving at speed $v$ separated by a distance $d$. I can work out magnetic and electric forces between them...
For the magnetic force, we treat the two beams wires ...
- 2,476
0
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1
answer
65
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Time lag for generation of electrostatic force
Suppose we make a certain point in space charged. Say we impart some negative charge, such that electrostatic condition is maintained.
Then, after the point gets charged will the electric field due to ...
- 321
-1
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2
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269
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U-shaped magnet and the moving charge: Where is the origin of the Lorentz force from the viewpoint of the moving charge?
Assume that a charge $+q$ is located at rest between the poles of an infinitely long U-shaped magnet, which is laid along the $x$-axis. If the charge slowly accelerates to a velocity $v$ along $x$ and ...
- 2,774
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66
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Deriving Lorentz force from relativistic force
By EQ.$72$ of this, Richard Haskell proves Lorentz force law in subsequent sections. During the proof he says that,
Suppose a conductor of charge density $\rho'$ be at rest inside a frame of reference ...
- 668
0
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2
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75
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Why can we add the two terms in the Lorentz force?
The term "Lorentz force" in the title refers to (1).
my textbook states:
The Coulomb force is mediated by the electric field and acts on the charge $q$, that is, $\mathbf{F}_e = q\mathbf{E}$...
- 165
0
votes
2
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670
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Electrostatic potential of a dipole in a non-uniform field
There are numerous derivations for the potential energy of a dipole in a uniform field as:
$$
U = - \boldsymbol{p}\cdot\boldsymbol{E}
$$
But does this hold also for non-uniform fields? Are there any ...
- 632
1
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1
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344
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Electric force in general relativity
In general relativity, for two electrons in a space-time how do we define the electric force? Is it such that we have in classical physics or they go away from each other because of the curvature that ...
- 39
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1
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65
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Is there a mathematical limit to the summation of infinitesimal magnetic and electric field in the Lorentz Force?
The addition of infinitesimally small parallel electric and magnetc fields, irrespective of their origin or source, or physical feasibilty; seems to produce a seemingly impossibly large force. Or at ...
- 471
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votes
1
answer
117
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How to calculate/understand the Lorentz force of a continueous charge distribution
I know that the Lorentz force formula is $$F=\iiint \rho(E+J\times B)dV$$ for continuous charge distribution. But is E the electric field that creates the current (density) J, or this is another ...
- 179
1
vote
1
answer
169
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Electric field on test charge due to dipole
In worked example 4.1 of Intermolecular and Surface Forces by Jacob Israelachvili, he is calculating the electric field on a test charge due to the dipole shown in the picture.
He assumes $r\gg l$ and:...
- 261
3
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3
answers
163
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Shouldn't We modify the field in force equation $\mathbf{F}=q\mathbf{E}$?
Consider charge particle $q$ in electric field $\mathbf{E}$. The force on the charge is given by
$$\mathbf{F}=q\mathbf{E}$$
Now we know that charge $q$ will also produce an electric field. Due to this ...
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