All Questions
Tagged with electromagnetism forces
524
questions
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543
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Formula for Force between two Solenoids
Given two identical solenoids (with appropriate core) $S_0$ and $S_1$ with length=$L$, radius=$R$, number of turns per unit length=$n$. Let these two solenoids be held with the two poles facing each ...
- 137
3
votes
2
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75
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Does it require greater force to accelerate a charged mass than an equal neutral mass?
Accelerating a charge produces radio-waves which is a form of energy. This energy has to come from somewhere. It would seem to suggest it would require greater force to move a charged mass than an ...
- 804
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How is Lorentz Force $BQv=BIl$?
The formula for Lorentz Force on moving charge is $$F=BQv$$ which for current carrying wire is modified to $$F=BQv$$$$=BQ\frac lt$$$$=BIl$$
Where $l$ is the length of the wire inside the magnetic ...
- 1,168
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Electromagnetic force for charges on a surface of discontinuity of the electric field
Suppose we have an infinite cylinder of radius $R$ in vacuum with some surface charge density $\sigma=\sigma(\varphi)$, where $\varphi$ is azimuthal angle. We want to calculate the force acting on one ...
- 149
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Generalised Geodesic equation for forces
im wondering if there is a general geodesic equation that describes the forces and how they act. For example I started off with the original nieve derivation of the geodesic equation:
$$\frac{d}{d\tau}...
- 775
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2
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463
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Electrostatic potential of a dipole in a non-uniform field
There are numerous derivations for the potential energy of a dipole in a uniform field as:
$$
U = - \boldsymbol{p}\cdot\boldsymbol{E}
$$
But does this hold also for non-uniform fields? Are there any ...
- 602
1
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205
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Force acting on a negative particle in a magnetic field
I have recently learned about magnetic fields and particles. The recent one I have learnt is the right hand rule. The force F acting on a negative particle is always opposite to the force we get from ...
- 11
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Would atoms be smaller or larger if the electromagnetic force was slightly weaker?
Some sites claim that atoms would be larger in size if the EM force was weaker, because the electrons would 'orbit', on average, farther from the nucleus....
Other physicists claim that atoms would, ...
- 4,509
1
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1
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296
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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
32
votes
6
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If I push someone, what fundamental force do I create?
According to Wikipedia, all forces can be decomposed to four fundamental forces: gravity, electromagnetism, strong interaction and weak interaction.
When I push someone, this generates a force. Which ...
- 1,440
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26
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Why does a magnet arranged in a magnetic accelerator propogate a wheel forward?
My question is related to an interesting video i saw on magnets. The link of the video is here https://youtu.be/iyv9GhaITNE , in this video at 1:52 of the video we see the wheel is moved forward but i ...
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In what coordinate would the Lorentz Force move in the following scenario?
If a positive current were moving into the page while surrounded by a ferromagnetic material shell; meaning the magnetic field magnitude at the center of the current is equidistant to it's origin; how ...
- 441
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1
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34
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Sphere analogy of non-contact force formulas like electrostatic force should again produce infinite Force when 1 charge of 2 spheres gets closer
Everybody is giving the sphere explaination but 2 touching parts of a sphere, I mean the touching charges in the smallest parts of these spheres that has the smallest charge on it again create ...
2
votes
1
answer
112
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Lorentz Four-force in General relativity?
In special relativity, it's normal to define Lorentz four-force density as $$f_\mu = F_{\mu\nu}\nabla _\lambda F^{\nu \lambda},$$
having Maxwell EM tensor $F_{\mu\nu}$. Can we do it in General ...
- 268
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226
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Doubt regarding $ F = BQv \sin \theta$
In $ F = BQv \sin \theta$, is $v$ velocity acquired by charged particle after entering magnetic field or is it already moving with $v$ m/s and $F$ force acts on it after it enters magnetic field?
