All Questions
144
questions
0
votes
1
answer
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
3
votes
1
answer
9k
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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 ...
- 413
1
vote
0
answers
1k
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Calculation of magnetic force magnitude from a parmenant magnet
I was wondering how strong a magnet should be in order to be able to horizontally attract 0.2 Kg of pure iron at a distance of 0.3 M. Since I know nothing about magnets, I started looking for ...
- 11
2
votes
1
answer
1k
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Magnetic Force on a Loop and number of turns
Suppose we have a rectangular current-carrying loop with current $i$, then we know that the magnetic force on each side can be found as:
$$F=iL\times B$$
Where $L$ is the vector in the direction of ...
- 36.4k
2
votes
4
answers
2k
views
Why in $F = iLB$, $L$ is a vector but $i$ is not?
I learned $F = iLB$ recently. However, I don't understand why $L$ is marked as a vector but $i$ is not.
For a normal rod, how should I define the direction of length vector $L$? And if I reverse the ...
- 123
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
2
votes
3
answers
4k
views
How does one calculate the force applied on an object by a magnetic field?
I've tried very hard to find an answer to this question, and every path leads me to an abstract discussion of fundamental forces. Therefore, I will propose two very specific scenarios and see if they ...
- 325
3
votes
2
answers
9k
views
Why exactly does current carrying two current wires attract/repel?
When to parallel wires carrying currents in same direction $I_1$ & $I_2$.
The MIT Physics Demo Forces on a Current-Carrying Wire this video demonstrates that effect.
My question is, why exactly ...
- 7,335
26
votes
6
answers
36k
views
Where do magnets get the energy to repel?
If I separate two magnets whose opposite poles are facing, I am adding energy. If I let go of the magnets, then presumably the energy that I added is used to move the magnets together again.
However, ...
- 363