All Questions
Tagged with electromagnetism forces
103
questions with no upvoted or accepted answers
4
votes
0
answers
785
views
Lorentz force on superconductor vortices
I am reading a paper on superconductivity and in it it says that the vortices are subject to a Lorentz force given by $$\vec{F}_L=\frac{\Phi_0\vec{I} \times \vec{H}}{cH}$$ Here $\vec{F}_L$ is the ...
- 41
3
votes
4
answers
87
views
Is the Lorentz force applied to bulk objects?
Assume that a bulk uniformly charged ($+Q$) nonconductive sphere is set in motion inside a uniform magnetic field. Is it correct to claim that the trajectory of the bulk sphere inside the magnetic ...
- 2,503
2
votes
0
answers
22
views
What are the conditions according to which the levitation force between a magnet and a superconducting material tends to zero?
According to this article, for a disk-like superconductor and a magnet, if the radius of the superconductor tends to zero or the radius of the magnet tends to infinity, it seems that the levitation ...
- 2,503
2
votes
1
answer
175
views
Does the charge distribution of two uniformly charged conducting spheres change as we bring them near each other?
Assume that we have positively charged two solid conducting spheres of the same radius and material. It is evident that the surface charge is uniform on them to eliminate the internal electric field ...
- 2,503
2
votes
1
answer
167
views
Are there any relativistic corrections to electrostatic attraction between two charges moving close to the speed of light?
If two opposite charges are moving at a velocity of $0.9c$ relative to a laboratory, but are at rest relative to each other (say the charges are moving in parallel), will there be any relativistic ...
- 79
2
votes
1
answer
153
views
On the infinite range of the electromagnetic force
I am curious as to whether there is a fundamental reason why weak and strong nuclear forces have such a short range whereas gravity and the electromagnetic force seem to have infinite range.
Since ...
- 1,638
2
votes
1
answer
207
views
Why is the force on an image charge the same as the force on the object it replaces?
Consider the arrangement of a point charge $q$ situated a distance $a$ from the center of a grounded conducting sphere of radius R (Griffith 4 th Ed. Example 2 or here). We find that we can replace ...
- 602
2
votes
0
answers
155
views
Reason for repulsion of like charges
Like charges repel and unlike attract. Like magnetic poles repel and unlike attract. Since electricity and magnetism are fundamentally linked , is this attraction/repulsion due to the magnetic fields ...
- 43
2
votes
0
answers
402
views
Odd experiment results (electromagnetics)
Okay, a bit of background. So I'm working on a linear accelerator (you might know it as a Gauss rifle), and I had worked through the equations I thought I needed (Magnetic force, displacement, etc.)
...
- 1,340
2
votes
0
answers
117
views
Consistency of equation with special relativity?
The following is the equation which, I want to know, if it is valid in relativistic domain. Consider two equal charges moving in same direction with velocity $v$ and charge $q$ at a separation of $d$....
- 3,148
2
votes
1
answer
708
views
The force between two magnets?
Does anyone know how to find the attraction/repulsion force between two magnets with arbitrary shapes.
What is the general formula for this ?
Thank you in advance.
- 130
2
votes
1
answer
541
views
Lorentz force in superposition of two magnetic fields
When an electron with charge $q$ travels with velocity $v$ perpendicular to a magnetic field generated between two permanent magnets with field strength $B$ and no electric field, it experiences a ...
- 652
1
vote
0
answers
131
views
Coilgun projectile force calculation
Please excuse me if I am completely wrong because I am a 9th grader but I hopefully am able to explain briefly about my problem. I was trying to create a function to calculate the Force of an iron ...
- 11
1
vote
0
answers
28
views
Which equation is most valid for finding power dissipation in a induced magnetic pendulum system?
Considering a set up where a conducting pendulum oscillates between two permanent magnets, I want to somehow calculate the power dissipated by the magnetic braking force the magnets provide, in order ...
1
vote
1
answer
94
views
Attraction/repulsion forces between two magnets
If I have two identical magnets of equal strengths producing equal repulsive forces between them, and if I replace one of the magnets with a stronger magnet (everything else remaining the same), how ...
- 11
1
vote
1
answer
35
views
Getting the force somehow using magneticfield force (tesla)
First off, sorry if not everything makes sense, english isn't my first language so some scientific terms may sound weird if they're in English. For a project we are making a coil gun. So we get a ...
- 11
1
vote
1
answer
61
views
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
vote
1
answer
132
views
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 ...
- 2,456
1
vote
1
answer
205
views
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
1
vote
0
answers
26
views
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 ...
1
vote
1
answer
92
views
Magnet A exerts an magnetic force $F_1$ on magnet B, B exerts a Reactive force $R_1$ on A, B exerts an magnetic force $F_2$ on A, is $R_1=F_2$?
Let's suppose there are 2 magnets, A and B, that are within the magnetic field of each other. Then A will exert a magnetic force on B (let's name it F1), and, due to the 3rd law of Newton, every ...
- 151
1
vote
2
answers
100
views
How do we apply force on a body?
We know that force is apllied either by pushing or pulling anything.
But how do we push or pull or apply force on anything.
I imagine the object A that is pushing and another object B that is getting ...
user316791
1
vote
0
answers
28
views
Lorentz force transmitted to two nodes
A straight wire of length $L$ and direction $\vec{u}$ carrying a continuous current $I$ in the presence of a magnetic field $\vec{B}$ experiences a force (Lorentz force) equal to $\vec{F} = LI \vec{u}...
1
vote
0
answers
23
views
Question on thinking about an electric charge as multiple electric charges in special relativity
I understand that thinking about permanent magnets as a rotating loop of charged particles can be used to derive things like how an electric charge will be effected by the magnetic field, and to ...
- 2,001
1
vote
0
answers
37
views
Does the Lorentz force change when an electric current is under a magnetic field with negative permeability?
Most applications of the Lorentz force depend on the electric current passing by a material with positive permeability, normally ferromagnetic.
How much would change were the electric current to pass ...
- 441
1
vote
0
answers
21
views
Force on a moving charge in front of an infinite conducting wall
Let's say we have a charge $q$ at position $\vec{x}=(x_0,y_0,z_0)$ in front of an infinite conducting wall at $z=0$. If the charge is not moving, this problem can be easily solved by the method of ...
- 4,827
1
vote
1
answer
37
views
Can you induce motion by changing magnetic field on a body which isn't magnetic?
In this video demonstration of Lenz's law, the narrator starts with a substance which doesn't respond to the magnetic field of a bar magnet yet when he moves the bar magnet in relative motion to the ...
- 7,980
1
vote
0
answers
47
views
Unstable Equilibrium of hinged rods
I conjured up a scenario where there are two rods free to rotate about a hinge connected by their ends by spring of spring constant $k$,both their masses are $m$ and length $l$ and mass is uniformly ...
1
vote
0
answers
27
views
How can I find the potential energy and force between a steel sphere and a magnet?
I'm fine with certain simplifying assumptions being made, I currently only know high-school level physics (the simpler the better). Also, if anyone can explain the intuition behind formulae, I would ...
1
vote
0
answers
60
views
What should be the equilibrium field strength in the Hall effect?
I was taught in my course and have confirmed by looking in many sources that when there are moving charges (e.g. current in a wire) which are deflected due to the Lorentz force (Hall effect), the ...
