All Questions
Tagged with electromagnetic-induction magnetic-fields
513
questions
0
votes
0
answers
18
views
How to find permeability of a magnetic material?
I have been working with magnetic materials for quite some time now and never really explored this fundamental parameter. After looking through the literature I realize there and quite few different ...
- 11
0
votes
3
answers
57
views
+150
Ampere's law on solenoid, using a circular loop
Suppose we take a long and tightly wound solenoid with current I going in it. We can find the field inside, by ampere's law, taking a rectangular loop and assuming the magnetic field just outside the ...
- 278
0
votes
1
answer
35
views
Internally, what defines whether a material is magnetically hard or soft?
I know that magnetically hard materials hold magnetic fields (magnetic moment alignment) for longer, while soft metals do not. However, what, internally, causes these properties to arise?
- 185
1
vote
0
answers
35
views
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
0
votes
2
answers
73
views
Magnetic flux and number of turns
The number of windings is not written in the magnetic flux formulas in high school textbooks, but I come across articles saying that the number of windings affects the magnetic flux formulas. Is this ...
0
votes
1
answer
32
views
Magnetic energy terms of system of three circuits
Say we've got a system of coplanar circuits like in the picture with same electric current flowing through them
We know that a system of circuits has magnetic energy
$$\mathcal U_{\,\mathrm m}=\dfrac{...
- 296
1
vote
1
answer
38
views
How does any changing magnetic field induce voltage?
Hopefully the title puts in well enough;
a charged particle moving in a magnetic field experiences the Lorentz-Force. If this occurs in a wire and part of the circuit is outside the B-Field then a ...
- 347
1
vote
3
answers
80
views
Work done in a moving conducting bar and in a Faraday disk
I deeply apologize for my ignorance, but I am asking this since I still can't seem to grasp what my teachers relayed to me a few days ago about two exercises that I solved in an intrinsically wrong ...
1
vote
0
answers
33
views
What is the reletive permeability of structual steel?
Help, i need to know what the reletive permeability is of a few materials (listed below) but i can not find the data on the internet. Does annybody know the data or where i can find it?
-s235jr
-...
- 11
0
votes
0
answers
59
views
Emf induction in a conducting coil placed in a variable magnetic field
Consider a conducting coil placed in a variable magnetic field. By the laws of nature, an emf will be induced in the coil. Between which two points is the emf induced in the coil?
If we consider it to ...
- 45
0
votes
1
answer
51
views
Straight wire cutting magnetic flux - Faraday's law
For a straight wire moving perpendicular to a uniform magnetic field in velocity v,
$$ε=\dfrac{\Delta \Phi}{\Delta t}=\dfrac{BLv \Delta t}{\Delta t}$$
So the induced e.m.f in the conductor as it moves ...
- 23
6
votes
3
answers
217
views
Ring Magnet with a wire in the middle
I have a very specific question concerning a system with a magnet and a wire.
Consider a ring magnet with a magnetic field directed right through its center. In the center of the magnet is a wire, ...
- 89
0
votes
0
answers
39
views
What is the induced electric field in a moving conducting material in a magnetic field?
I've been taught that the induced EMF in a conductor is the rate of change of flux in it, but Maxwell's equation
$$
\nabla\times\vec{E} = -\dfrac{\partial\vec{B}}{\partial t},
$$
only states so for ...
2
votes
1
answer
55
views
Does making a magnet move require more energy than a non-magnet?
I know that electric fields store energy, with their energy in an infinetesimal volume being proportional to $E^2$ at that point. I also know that a moving magnet creates an electric field (...
- 531
0
votes
0
answers
12
views
Self-induction in a permanent magnet
when a permanent magnet is moved in a coil, an emf is induced in the coil. so is an emf also induced in the magnet itself? and if not then why not. and if I replace this permanent magnet with a ...
- 117