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# Questions tagged [electromagnetism]

The classical theory of electric and magnetic fields, both in the static and dynamic case. Also covers general questions about magnets, electric attraction/repulsion etc. Distinct from electrical-engineering.

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### Dependence of electrostatic force on the surrounding medium

Two unlike point charges held at a fixed distance from each other. The force between them is measured. Then a brass rod is placed exactly in the midpoint of the line joining the 2 charges. Will the ...
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### Question about action-reaction pair of two wires carrying current in the same direction

Imagine two wires lined up so that they are parallel, and that they both have a current running through them in the same direction. The magnetic field produced by the current of one of the wires (say,...
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### Poincaré invariance of linearly polarised plane wave

I am reading a book that just quotes the Lie group generators and the discrete subgroups that leave a linearly polarised plane wave unchanged. And I have no idea how to derive them. Context The ...
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### Conducting wire covered by a paramagnetic dielectric

How does the conductance of a conducting wire change if it is covered by a paramagnetic material comparing to a diamagnetic one? I am interested in the DC or low frequencies response mainly. For me ...
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### Magnetic field lines vs. Electric field lines

What's the difference between magnetic field and electric field lines? Does $d\vec B$ point in the direction you would experience a force if you were a moving charged particle at that point? I know ...
62 views

### Why gravitational waves are not part of thermal phenomena?

Electromagnetic waves are part of thermal phenomena in the form of thermal radiations. But why gravitational waves do not show up as a thermal phenomenon, for example, why gravitational waves do not (...
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### How to define a non-uniform mangetic field in Geant4 simulation?

I am getting stuck in creating a gradient magnetic field by Fieldmap method in example of field04 (geant4/extend/field/field04). At the moment, I am doing OK with creating a uniform one by creating a ...