All Questions
144
questions
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2
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179
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A question about magnetic field lines
In the simple experiment of spraying iron filings around a magnet, why doesn't the magnetic field (provided that it is strong enough) cause the iron filings to form a $3\mathrm D$ skeleton along the ...
- 105
0
votes
2
answers
55
views
Can we change the trajectory of a body in space using external means?
Suppose a block of metal is floating around in space....can we change its trajectory by external fields?Is it possible if yes then by what type of waves?
- 298
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0
answers
47
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How are the two definitions of $\vec B \, $, as magnetic field and magnetic flux density, same?
My question, is primarily, based on this question, in which the accepted answer asserts that $\vec B \, $ has two definitions,
As magnetic field$^*$, using Lorentz force $\vec F=q \vec v \times \vec ...
- 455
-3
votes
1
answer
74
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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
2
votes
1
answer
217
views
An absurd consequence of magnetic field as an axial vector
One of the definitions of magnetic field (in free space): Force on magnetic north pole per unit pole.
Magnetic field is an axial vector. So it changes its sign when we use left handed coordinate ...
- 772
1
vote
1
answer
145
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Understanding of Gauss law using vector fields
I was going through the conventions and terminologies followed to describe the magnetic interactions. I understood that the field lines are just a simpler representation of the magnetic interaction ...
- 273
0
votes
1
answer
2k
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What is $dB/dx$ where $B$ is magnetic field and $x$ is the separation between two magnetic dipoles?
I came across a question regarding the force between two magnetic dipoles $M_1$ and $M_2$ separated by a distance $x$ .
Here in this text book I am given the solution is
$$ B = \cfrac{\mu_0}{4 \pi}...
- 29
0
votes
0
answers
48
views
Magnetic force between broken magnetic circuit
The above image shows the flux flow through a rectangular core. We know the purpose of the core is to concentrate as much of the flux through it as possible, so we'll assume no or minimal stray field ...
- 877
1
vote
2
answers
91
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What is $\mathbf{l}$ (boldfaced ell) in Lorentz force law $\mathbf F= I\int (d\mathbf l \times \mathbf B)$?
Consider the $yz$-plane. There is a wire in which a current of magnitude $I$ runs from $(y=a/2, z=a/2)$ to $(y=-a/2, z=a/2)$. There is a uniform magnetic field $\mathbf{B}$ along the length of the ...
- 908
0
votes
1
answer
61
views
Will a led, connected to a long conducting rod, shine when the rod is falling through the magnetic field of the Earth?
Visualize a long conducting rod of length $l$ falling towards the Earth (after being released from a hight of say $5(km)$) perpendicularly to the Earth's magnetic field.
Near the earth's equator, ...
2
votes
1
answer
150
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Force on Magnetic Dipole - Equivalent Formulas?
I have seen two different ways of expressing the magnetic force on a dipole moment in a non-uniform magnetic field:
$\vec{F_a}=(\vec{m}\cdot\nabla)\vec{B}$
or
$\vec{F_b}=\nabla(\vec{m}\cdot \vec{B})$ ...
- 23
2
votes
0
answers
155
views
Reason for repulsion of like charges
Like charges repel and unlike attract. Like magnetic poles repel and unlike attract. Since electricity and magnetism are fundamentally linked , is this attraction/repulsion due to the magnetic fields ...
- 43
3
votes
2
answers
303
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Origins of $\vec F = q\vec v\times\vec B$
I was just wondering if this relation for the magnetic force exerted on a moving charge $\vec F = q\vec v\times\vec B$ actually has a derivation or is it just a definition? Im inclided to believe it ...
- 157
2
votes
1
answer
542
views
Lorentz force in superposition of two magnetic fields
When an electron with charge $q$ travels with velocity $v$ perpendicular to a magnetic field generated between two permanent magnets with field strength $B$ and no electric field, it experiences a ...
- 652
0
votes
1
answer
392
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Electromagnetic Force vs Magnetic Force
I am confused between these two types of forces, what makes them different? For example, a moving ferromagnetic object in a solenoid that moves because of a magnetic field created. Which field would ...
