All Questions
10
questions with no upvoted or accepted answers
2
votes
0
answers
24
views
How many electrons in a ferromagnetic material, per atom, have their spins pointing in the same direction?
Is there a list or chart somewhere that states, approximately, how many outer electrons per atom in a particular ferromagnetic material are aligned?
Are there, say, five electrons in an FeO2 magnet's ...
- 4,509
2
votes
0
answers
428
views
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
1
vote
0
answers
11
views
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
91
views
How to reduce magnetic field between two magnetic shield sheets (silicon steel sheets)?
I put 2 parallel silicon steel sheets between magnetic field as below:
As silicon steel has much bigger permeability than air,magnetic line will go through 2 silicon steel sheets.
What I can do to ...
- 127
1
vote
0
answers
27
views
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
0
votes
0
answers
20
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
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
0
votes
1
answer
42
views
Drone's sufficient engine RPMs initiated by Magnetic Fields
I've seen many videos where magnets are used to initiate and boost RPMs. Most of them are fake, where people are using compressed air at the backstage.
Did anyone of you actually tried to challenge ...
- 1
0
votes
1
answer
77
views
Confusion regarding torque given by M×B
The magnetic torque acting on a loop of magnetic moment M placed in a magnetic field B, is given by τ=M×B.
My question is, about which axis does this give the torque about?
Is it the instantaneous ...
- 257
0
votes
1
answer
49
views
Can magnetic resonant inductive coupling work in magnetic resonance (specifically in NMR and MRI)?
Radiofrequencies are usually used to flip polarized nuclei in a magnetic field in NMR and MRI. These RF correspond to the Larmor frequency of those nuclei.
Since the effect from the RF is usually due ...
