All Questions
Tagged with electromagnetic-induction magnetic-fields
149
questions with no upvoted or accepted answers
1
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47
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Incongruent expressions for $E$- and $B$-fields based on approach
I am having two issues with Maxwell's equations in the following problem:
A thin conducting disc has radius a thickness b and electrical
resistivity ρ. It is placed in a uniform time-dependent ...
- 545
1
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1
answer
57
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Motional EMF inside material with resistance
A square loop is cut out of a thick sheet of material with each side of resistance R. It is then placed
so that the top portion is in a uniform magnetic field B, and is allowed to fall under
gravity.
...
- 105
1
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0
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57
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How to determine the "polarisation" of the magnetic field caused by magnetic induction?
I'm having trouble wrapping my head around the idea of magnetic induction caused by the current flow in a wire.
Considering that the magnetic field created by current flow is circular in its very ...
- 573
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37
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Can you induce motion by changing magnetic field on a body which isn't magnetic?
In this video demonstration of Lenz's law, the narrator starts with a substance which doesn't respond to the magnetic field of a bar magnet yet when he moves the bar magnet in relative motion to the ...
- 7,980
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106
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Is this analogy of Induced emf correct?
I have searched PSE (and many other sites on internet) for the theoretical reason of induced emf. All I got was that the phenomenon of Induced EMF is experimental fact and can only be mathematically ...
- 876
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Two bar magnets taped together in opposite direction (north-south) dropped through a coil
I conducted an experiment where I have to align two bar magnets so that both ends are “north - south” and tape them together. Then, I have to drop them through the center of a coil of 400 turns
...
- 11
1
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0
answers
27
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Relation between drift velocity and area velocity
Is there any relation between drift velocity and area velocity?
And how I can to find area velocity for electrons in a magnetic field?
- 31
1
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1
answer
221
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Is this a correct way of finding magnetic field of a magnet created with Wasilewski's method?
$\quad$ Wasilewski's method (Or the method that could be seen in Dr Stone episode 9) consists of piece of iron being struck by a lightning, which then magnetises it. Let's say, we have a cylindrical ...
- 333
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47
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Why no Magnetizing inductance on the secondary side of the transfomer model?
Here is the electrical model of a transformer :
Why there is no magnetizing inductance in the secondary side ? Actually the model is true if we want always passing current from the primary side to ...
- 177
1
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0
answers
113
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MHD pump liquid metal flow speed
a rather simple question, are there any studies or some information about the flow speed of liquid metal inside a tube?
My setup is basically a 50cm diameter circular tube (could be another diameter) ...
- 91
1
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75
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Eddy Current Pendulum and Variables of Breaking Force
I am trying to conduct an experiment about eddy currents, specifically using an aluminum plate pendulum, two permanent magnets, high framerate camera. I am altering the distance between the two ...
- 11
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42
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Where does this form of the induction law come from?
I am currently studying a eddy current disk break and came across this promising paper (PDF, princeton.edu) from 1942.
However, in the first formula a suspicious $4\pi$ appears before the current $U(...
- 31
1
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1
answer
34
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Does a magnet lose more potential when (passivley) magnetizing another metal?
Does a magnet lose more of it's magnetic potential when (passively) magnetizing a second (ferromagnetic) metal compared with simply being left alone for the same amount of time it took?
- 11
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73
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Why not change magnetic flux only at the edges?
I learnt Faraday's Law of Induction however I was confused about why the area aspect of magnetic flux impacts on the EMF generated.
Why do magnetic field lines inside the coil area affect the EMF ...
- 2,356
1
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38
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EMF developed in a varying magnetic field
Let's say there's a cylindrical varying magnetic field (varying at a constant rate) and I have a conducting body, let's say a rod placed in a plane perpendicular to magnetic field. I am having a ...
