All Questions
Tagged with electromagnetism forces
524
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Currents and magnetic fields produce forces that affect things they're not touching?
I was doing this past paper and am a little confused by question 5) part c)ii)
I correctly calculated that the force acting on the rod due to the magnetic field is 0.016N but I can't see how this ...
- 159
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2
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773
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How to calculate the force acting on a magnet due to a solenoid
Can I assume both magnet and solenoid as magnetic dipole and use Coulombs law to find the force acting the magnet?
- 131
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How do magnetic objects exhibit attraction/repulsion across empty space?
Magnets will attract or repel over a distance before physically touching each other.
What makes this effect possible? My best guess is that the forces generated by the angular momentum of the ...
- 197
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Why don't black holes form from forces other than gravity?
Gravity is the weakest of the fundamental forces, so what is so special about gravity that it can form an inescapably strong field while a force like the EM force cannot? It seems to me that if there ...
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Does a current-carrying wire running through the centre of a solenoid experience force?
Imagine looking at a solenoid from above. Current passing is through it in a clockwise direction. The direction of the field lines therefore is towards the bottom of the solenoid.
Now pass a straight ...
- 139
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735
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Contradicting forces on a circular loop under current in magnetic field?
I have the following general conceptual concern.
Think of a thin conducting loop of radius $R$ placed in the $x$-$y$-plane at $z=0$. There is a homogeneous current density $\vec{j}$ running through ...
- 1,517
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How far could one fire a charged particle in space?
I've wondered how far would be able to send a concentrated beam of electrons in space. The reason is would we be able to launch a magnetic ring with an electron absorbing material on one side and just ...
- 163
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Does the Lorentz force applied to a current carring wire by a magnetic field act in the negative or positive direction of the right hand rule?
If I say that I am calculating the Lorentz force $F$ applied to a wire carrying a current $i$ at a point $P$ in a magnetic field $B$, would the actual force be opposite of that given by the right hand ...
2
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1
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Cause of radiation resistance
I was reading Radiation Damping and light scattering from Feynman's lectures on physics. The following excerpts are from chapter 32, Vol I
What is this radiation resistance due to? Let us take a ...
- 3,148
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Do two magnets stacked on top of each other repel/attract stronger than just one magnet?
In designing a switch, I made it such that it "springs" back via two neodymium magnets (one in button repelling one in switch). I've found the magnets are too weak and don't spring back. I've resorted ...
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Classical electrodynamics formulated in terms of forces
The Newton's law of universal gravitation is described in terms of a force, which is produced by an action at a distance. It also can be described using the concept of a field, and that would be an ...
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Does the magnitude of an electrical field change with frequency?
I am trying to model the frequency response of a force (dielectrophoresis) that is based on gradient of an electric field.
One of the components is the CM factor which has a frequency component, but ...
- 21
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239
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Want to achieve maximum magnetic force & find out the max point [closed]
Hi Sir/ Madam
Want to achieve maximum magnetic force & find out the max point for this setting, want to know
is the strongest magnetic force must in the 'dot' area ( middle poin of setting )
...
- 11
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Force between two bar magnets
I need to know how to calculate force between two bar magnets. I searched and found an answer on Wikipedia, but I don't really trust Wikipedia, a lot of crazy stuff is posted there.
So I searched ...
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4
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Do electric and magnetic lines of force physically exist? [closed]
As per my imagination any thing can't impose force on the other by not giving even a touch(i,e action at a distance). So I thought there must be some physical existence of lines of force. Although ...
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