All Questions
144
questions
1
vote
1
answer
116
views
Magnetic force calculation for parallel wires using Maxwell stress tensor. Issue with shear forces
I am trying to calculate the forces in between permanent magnets and ferromagnetic surfaces with the Maxwell stress tensor using image theory and the Biot-Savart law. However I discovered a weird ...
- 23
0
votes
1
answer
58
views
Why the magnet travels through solenoid faster if we connect a bulb to a solenoid
When a magnet travels linearly through a solenoid at a fast enough velocity if the ends of solenoid are connected to each other, the induced EMF generated and Lenz Law the solenoid opposes the motion ...
- 25
29
votes
11
answers
6k
views
Is there a more "physically mature" way to think about the right hand rule with electromagnetism?
I've always found using the righthand rule to remember how forces, B-fields, and particle velocities to be intellectually cheating myself a bit. It feels like being able to multiply numbers by using ...
- 719
0
votes
1
answer
57
views
Does a levitating Superconductor experience reistance to motion from the magnetic field if a force is applied?
If one has a superconductor that's being levitated on a track and you apply a force through its c.m. completely parallel to the track it's on (perpendicular to gravity), would there be any kind of ...
0
votes
2
answers
165
views
Is force perpendicular to magnetic field in a bar magnet?
Recently I started this topic. My lecturer used
$$F_{B}=q_{n}B$$
I have two questions in this topic.
By this equation both the magnetic field and Force are in same direction. But aren't they supposed ...
- 97
0
votes
1
answer
60
views
Can a net propulsive effect occur between phase shifted antennae?
So this question centers around an electromagnetic thought experiment suggested by the patent titled "Efficient RF electromagnetic propulsion system with communications capability", ...
- 393
1
vote
2
answers
102
views
Does the force between two magnetic poles ever reach zero?
If we hold two magnetic like-poles together and start to move them away, would the repelling force reach absolute zero at certain point?
In that scenario, as a layman, I think that there is something ...
user342647
1
vote
3
answers
250
views
Why is the cross product used in electrodynamics [closed]
For example, $F = I \times B$. Why would the force be perpendicular to both the magnetic field and the current? Why would the resultant force be totally unlike its 2 sources; this could be likened to ...
- 213
0
votes
1
answer
544
views
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
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 ...
0
votes
1
answer
226
views
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?
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
0
votes
1
answer
822
views
Can magnets really repel water (liquids) like this?
I have read this question:
However, in a small number of solids the outermost electrons of the atoms line up parallel with each other and their magnetic moments reinforce each other to give the solid ...
- 29k
3
votes
3
answers
398
views
Detect reaction force to Lorentz force
If a charged particle is deflected in a magnetic field due to some magnet, is there any experiment that shows (or measures) the opposite reaction force (due to Newton's third law) on the magnet?
- 737