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Results tagged with electromagnetism
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user 299634
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
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Is the force applied on a ferrous object by a magnetic field determined by the field strengt...
Both.
The field gradient (derivative) generates a translational (moving) force on the ball directed towards a region of higher field strength. This is used e.g. for magnetic tool bits or connectors. I …
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Can we express magnetic field strength similar to how we express electric field strength?
Usually the magnetic field strength is called $H$. Its unit is A/m.
$B$ is magnetic induction in Tesla and is a consequence of a magnetic field. It is Given by $H$ mulitplied with the local permeabili …
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Changing magnetic and electric field
example of changing -> constant:
Change the magnetic field through an open loop at a constant rate and you will induce a constant electric field between the open poles
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Investigation with magnets
Could it be that depending on the position of the paperclip on the magnet, it could have different magnetic strength?
Yes. The external magnetic field depends on the shape of the magnet and the dire …
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Is magnetic flux through a closed surface still zero if you just have the North pole of a ma...
The field lines enter the region through the magnet interior.
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What is the definition of direction of current?
It will be the direction of the moving charge. (current is charge moved per time).
But note that a charge carrier cannot be just "made" to move against the field..You need a field which is stronger th …
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Metal/good conductor frame in a changing magnetic field
the electric field is not always zero.
If the magnetic field changes steadily, a steady non-zero voltage builds up between A and B in accordance to faraday's induction law.
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Néel temperature versus Curie temperature in ferrimagnetic materials
In my experience the magnetic ordering temperature is called Néel temperature only for antiferromagnets. For other types of order, including ferrimagnetism, it is called Curie temperature.
However, as …
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Can you perfectly control electric currents' behavior in anisotropic media?
If you know the conductivity tensor $\sigma(r)$ and have perfect control over the magnetic field $B(r,t)$, then yes you can use Maxwell equations to exactly determine the field profile to generate the …
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Phase transition on magnetic materials
It will become ferromagnetic again.
The domain pattern and magnetization state will be different to before unless a single state is strongly preferred due to a mixture of other boundary conditions suc …
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Variations in Refractive Index of Materials
Heavy glasses are mainly heavy because the use elements such as lead with many nuclei. As a result, these materials also have more electrons per atom, especially in the higher (more loosely bound) orb …
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