All Questions
18 questions
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2
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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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votes
1
answer
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
1
vote
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
-1
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2
answers
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
0
votes
3
answers
108
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Forces and magnetic lines of force
Magnet releases the magnetic lines of force which can attract magnetic substance. Can all the non-contact forces (such as gravitation, electrostatic, etc) release these so called lines of forces? If ...
- 405
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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
0
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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
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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
2
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2
answers
2k
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Similarity between electromagnetic waves $E/B=c$ compared with the equality between Lorentz force and electric force
I am very tired and in this moment I have not think very well. Using the vectorial expressions of the magnetic and electric field if an electromagnetic wave propagates in a certain direction the ...
- 2,675
-3
votes
1
answer
79
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Regarding the Lorentz force:
I know that the Lorentz Force law states that:
$\vec{F} = q\vec{E}+q\vec{v} \times \vec{B}$
And then for the magnitude of the force, where $q_2$ is the moving charge:
$E = F/q_2$, and therefore $E =...
user239757
0
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0
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367
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How to calculate the velocity and radius of curvature of a charged particle in a perpendicular magnetic and parallel electric field?
If I have a charged particle come from a point velocity V1 where there is a uniform electric field parallel to the motion of the particle which accelerates it and a magnetic field perpendicular to ...
- 1
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4
answers
158
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Can every mass obey the Newton's 3rd law?
As in, if we were able to produce a very huge amount of force on a very small body, would it push back with the same force? Given it doesn't break or disintegrate.
Like if we electromagnetically put ...
0
votes
1
answer
526
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Direction of magnetic field lines around a conducting wire
By way of the first uploaded picture I was taught that magnetic field-lines around a long conducting wire with a current are shaped like concentric circles around the wire. However, a few pages ...
- 559
0
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2
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6k
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Relationship between Magnetic Field and Electric Field along with velocity and kinetic energy [duplicate]
I need to understand how the magnitude of the acceleration of a proton will change once it enters a region in where there is a uniform magnetic field and/or electric field?
So, let's say for example ...
- 67
0
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1
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57
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Particle size that can be driven by electrical field or magnetic field
Does anyone know what size-range of metal particles can be driven by either electrical field or magnetic field? For example, should the size be nano-meter range or micrometer?
