All Questions
Tagged with electromagnetic-induction magnetic-fields
149
questions with no upvoted or accepted answers
2
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0
answers
428
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Energy of Magnetic Dipole
What is the total energy of a magnetic dipole, $\textbf{m}$, in the presence of a magnetic field $\textbf{H}_s$?
I've seen the typical answer given is:
$U = - \textbf{m}.\textbf{B}\Delta_v + U_s$
...
- 21
2
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answers
56
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Ocean warming by induced electric current for wandering magnetic poles?
In a post on the co-rotation of Earth and its magnetic field (Does the geomagnetic field rotate?), John Rennie raised the point that, if Earth's magnetic field were rotating about its dipole axis, it ...
- 21
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84
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How do you apply "flux-rule" in free space?
Faraday's law of induction states that, the tangential component of the force per unit charge$^*$; EMF produced in a loop of wire, is equal to change in the magnetic flux through the loop,
$$\int_C \...
- 455
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271
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How is the magnetic flux density inside a current tube affected by an inner wire?
Background to problem
Conventional wisdom informs that the magnetic flux density inside a tube carrying current is zero everywhere. Pictorially this is represented by this finite element analysis (...
- 256
2
votes
2
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391
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The direction of the induced electric field
Recently I got stuck witht the following problem.
Imagine we have uniform a magnetic field which induction points upwards. The fields strength is steadily decreasing. If we put an iron coil ...
- 103
2
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45
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Conductor in motion in a magnetic field
I have the following exercise: there is a square conductor of a given side L and resistance R. The conductor is surrounded by a magnetic field B (90° with the y-axis) and it depends from z: B(z) = K*z,...
2
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178
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Can magnets induce magnetism stronger then their own magnetism?
This might sound foolish but bear with me for the explanation.
I came across a weird magnetic behaviour playing with coins on a mac. There are magnets in mac, two on the top corners of the screen and ...
- 121
2
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885
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Finding the terminal velocity of a magnet dropped in a solenoid
We have to find proportionality of the terminal velocity with the factors of the system:
Plot: a small dipole(mass $m$) with dipole moment $\mu$ is dropped in a long solenoid (radius $r$, ...
- 2,479
1
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35
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Confused between induced emfs
We know when flux of B changes an EMF is induced in loop
And also when a rod moves in mag field Potential difference between its ends is also produced.
So is this ques while writing Potential equation
...
- 11
1
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33
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What is the reletive permeability of structual steel?
Help, i need to know what the reletive permeability is of a few materials (listed below) but i can not find the data on the internet. Does annybody know the data or where i can find it?
-s235jr
-...
- 11
1
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9
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Induced current density and magnetic field arising from forced oscillations of particles in a constant magnetic field?
I am being confused by what should be a simple physical scenario. Let's say I have a small, cylindrical region of radius and height are both $a$ filled with a medium of both positive and negative ...
- 11
1
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0
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11
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Is there any way to detect localized magnetic field change in a magnetic material or powdered magnetic material?
Hi I was wondering if there was any way to detect localized magnetic field change within either bulk magnetic material or within like powdered magnetic material. The application we are looking for is ...
- 11
1
vote
1
answer
35
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Getting the force somehow using magneticfield force (tesla)
First off, sorry if not everything makes sense, english isn't my first language so some scientific terms may sound weird if they're in English. For a project we are making a coil gun. So we get a ...
- 11
1
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0
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57
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Static toroidal magnetic field rotating inside toroidal winding
what would happen if I took a toroidal core, generated a static toroidal magnetic field in the core and then rotated the core around it's symmetry axis within a larger stationary toroidal winding ...
- 91
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Which way does current flow in coronal loops and filaments?
My understanding is this: the Solar surface becomes speckled with more sunspots near Solar maximum, and these spots tend to form groupings known as active regions; each spot is associated with a given ...
- 166