All Questions
9
questions
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Hysteresis curves of a ferromagnet magnetized below saturation
I am confused about the qualitative behavior of ferromagnetic materials. Referencing the diagram below, I understand that magnetizing a ferromagnet from point A to point C (its saturation ...
- 1
1
vote
0
answers
48
views
Do we experimentally know how a magnet reacts in a curling / non-zero-curl magnetic field?
There are two possible formulas for the magnetic force on a magnetic dipole moment due to the inhomogeneity of the magnetic field:
$$ \vec{F}_{A} = \nabla (\vec{m}\cdot\vec{B}) \qquad\text{ and }\...
- 8,660
1
vote
1
answer
115
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Investigation with magnets
Take the following method for an experiment with magnets.
Method:
Hold the magnet about 1 m above the desk
Place a paperclip at the end.
Add another paperclip until the chain cannot hold any more
...
0
votes
1
answer
515
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Finding out the magnetic field at anypoint outside a permanent magnet (Cylinder,Cube)
I am working in a project where I am using different shaped permanent magnets for levitation of diamagnets. I am facing problem while calculating the magnetic field around these permanent magnets. To ...
2
votes
1
answer
546
views
How are these "supplementary" or "satellite" Helmholtz coils used?
Three mutually orthogonal pairs of Helmholtz coils can be used to produce a fairly uniform magnetic field of arbitrary direction within a certain volume, and/or to null/cancel an external field (e.g. ...
- 6,273
3
votes
1
answer
145
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Why does a television image rotate to the right when one side of the magnet is applied, and to the left when the other is applied?
If you have a television that displays the image of a clockwise spiral on a white background, and you apply one side (pole) of a strong magnet such as a good size neodymium iron boron magnet - the ...
- 411
-1
votes
1
answer
827
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Why can't weak core-less electromagnets be used in conjunction with strong permanent magnets to perpetually harvest energy? [closed]
Why can't weak core-less electromagnets be used in conjunction with strong permanent magnets to perpetually harvest energy?
Magnets will attract ferrous materials but some materials like copper or ...
- 151
1
vote
0
answers
72
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Why is it necessary to break symmetry to get magnetoelectric effect in multiferroics?
Spatial or time symmetry needs to be broken for both magnetic and electric to happen in the same material. But how is symmetry hindering the process?
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1
vote
3
answers
16k
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How to demagnetize a magnet temporarily?
How to demagnetize a magnet temporarily? Is it possible making a permanent magnet demagnetize for a short span of time? Or at least long time but temporarily!
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