All Questions
Tagged with electromagnetism forces
524
questions
0
votes
1
answer
5k
views
What kind of force is it when you push a door shut? [duplicate]
Possible Duplicate:
How can I stand on the ground? EM or/and Pauli?
It probably seems like a silly question to a physicist, but I'm from a pure maths background and don't know an awful lot about ...
- 981
9
votes
6
answers
7k
views
Are the field lines the same as the trajectories of a particle with initial velocity zero?
Is it true that the field lines of an electric field are identical to the trajectories of a charged particle with initial velocity zero? If so, how can one prove it?
The claim is from a german ...
- 191
1
vote
1
answer
615
views
Calculating the direction of the force acting on a source of magnetic field
I do not know how to calculate the direction, or unit vector of the force that appear between two magnetic field sources.
For example, let's assume I mean a current-carrying-wire by 'source of ...
- 165
3
votes
1
answer
258
views
The force exerted by a ~10 Tesla magnet on a C13 isotope?
How much force would a ~10 Tesla magnet exert on a weakly magnetic C13 isotope? If I made a molecule of diamond with $N$ C13 atoms, how large would $N$ need to be for me to pull on it with something ...
- 31
2
votes
2
answers
815
views
Demonstrate magnets adhere to conservation of energy pursuant to the laws of thermodynamics
I am looking for a way to demonstrate that magnets adhere to the laws of thermodynamics, in particular the requirement that energy in a closed system be conserved.
To adhere to the requirement that ...
- 209
1
vote
1
answer
2k
views
How positively charged protons remain glued to each other while they should repel each other out of nucleus? [duplicate]
Possible Duplicate:
Protons' repulsion within a nucleus
How positively charged protons remain glued to each other while they should repel each other out of nucleus?
- 11
56
votes
13
answers
23k
views
Is there an intuitive explanation for why Lorentz force is perpendicular to a particle's velocity and the magnetic field?
The Lorentz force on a charged particle is perpendicular to the particle's velocity and the magnetic field it's moving through. This is obvious from the equation:
$$ \mathbf{F} = q\mathbf{v} \times \...
- 677
9
votes
2
answers
8k
views
We know that the protons in a nucleus are positively charged. So why does the nucleus stay intact? [duplicate]
We know that the protons in a nucleus are positively charged, whereas the neutrons do not possess a charge; we also know that unlike charges attract. So why does the nucleus stay intact, even though ...
- 833
2
votes
2
answers
349
views
Interaction speed between electric charges and magnetic materials
Einstein said that the speed of a matter in universe cannot exceed the speed of light.
Is it correct for electric force transmission speed from one electric charge to other one?
What is transmission ...
- 521
3
votes
2
answers
507
views
Does constraint for speed of Electric and magnetic fields violates Conservation of momentum or Newton's third law?
I'm just a beginner so bear with me. Consider two frames at rest wrt to each other separated by distance enough for light to take a minute or so. At a given instant we create two large dipoles by some ...
- 31
27
votes
4
answers
6k
views
Is the EmDrive, or "Relativity Drive" possible?
In 2006, New Scientist magazine published an article titled Relativity drive: The end of wings and wheels1 [1] about the EmDrive [Wikipedia] which stirred up a fair degree of controversy and some ...
user8616
1
vote
4
answers
2k
views
Magnetic force and work
If the magnetic force does no work on a particle with electric charge, then:
How can you influence the motion of the particle? Is there perhaps another example of the work force but do not have a ...
- 1,516
19
votes
2
answers
4k
views
What is degeneracy pressure?
What is "degeneracy pressure"?
I know there are 4 fundamental forces- EM, gravity, weak and strong. But then degeneracy comes along ubiquitously in everything right from neutron star to the ...
- 2,853
6
votes
2
answers
1k
views
Lorentz force law in Newtonian relativity
I know that in special relativity Electric and Magnetic fields mix together in different reference frames, but my question is about classical mechanics.
It seems weird to me is that the Lorentz Force ...
- 1,075
44
votes
5
answers
20k
views
Can the Lorentz force expression be derived from Maxwell's equations?
The electromagnetic force on a charge $ e $ is
$$ \vec F = e(\vec E + \vec v\times \vec B),$$
the Lorentz force. But, is this a separate assumption added to the full Maxwell's equations? (the ...
- 1,352