All Questions
26
questions
0
votes
1
answer
34
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
2
answers
42
views
Magnetization current when two magnets are brought together and the Lorentz force law
Suppose we have two ferromagnetic objects constituting two permanent magnets. A classical way to think of the two magnets repelling/attracting each other would be by ascribing bulk and surface ...
- 8,640
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
0
votes
1
answer
310
views
What will happen if I pass Current through Permanent bar Magnet?
Following the Picture below,
If I Conduct current through Permanent magnet Bar and hold the battery still. Will the magnet move in any direction ? Thank you.
- 21
2
votes
0
answers
30
views
How to calculate the Force between a magnet & an induced dipole? [closed]
https://www.youtube.com/watch?v=xTwDZJG_W9w
In this video at 9:12 it details the potential energy of an induced dipole
Specifically
$$U=-mBcos\theta=(\frac{\chi V}{\mu_0}B)Bcos\theta$$
&
$$F_z=\...
- 87
2
votes
2
answers
165
views
Energy Conservation when two permanent magnets attract each other
I have a very basic doubt related to energy conservation in a system of magnets. Suppose I have two magnets (bar magnets) of magnetic moment $M$ kept along the line with an initial distance $X_0$ such ...
- 31
1
vote
2
answers
128
views
How Mars have so less magnetic field if it spins?
Moving charges have magnetic fields. If Mars spins, it moves and so the core with it and so will the electrons inside it. Then why it needs liquid core to have strong magnetic field, what about the ...
- 21
0
votes
2
answers
172
views
Why armature is being rotated in DC generator?
I am wondering about why armatures are being rotated instead of being static?
The magnetic flux will still cut the armature windings and because of this induced current will be generated.
So, why it ...
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
0
votes
2
answers
755
views
How can I find the force of a solenoid with a moving plunger?
It seems like it should be a simple equation, until I realized that the core isn't magnetized until it is induced, then there is a dipole moment, and then as it moves the core of the solenoid ...
- 103
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 ...
- 4,515
1
vote
3
answers
1k
views
How to mathematically show that magnetic field in Helmholtz coil is homogeneous
From the title of the question you have probably already figured out what my question is...
How to mathematically show that magnetic field in Helmholtz coil is homogeneous?
I know that magnetic field ...
0
votes
2
answers
100
views
Does a straight, current-carrying wire always repel a permanent magnet? Regardless of the permanent magnet's orientation?
Several people have told me that a current-carrying wire usually (or always) repels a nearby permanent magnet....
Most recently, I saw this Veritasium video on YouTube: 'How Special Relativity Makes ...
- 4,515
0
votes
1
answer
241
views
Ampere's law: the position of amperian loop
Can Amperian loop be taken parallel to current. I.e suppose current is in a circular loop in xy plane. And let the screen you are watching is xy plane . Can we take amperian loop in the same plane.
...
- 95
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