I Why Can Tzz in Maxwell's Stress Tensor Be Non-Zero in Electrostatics?

AI Thread Summary
Tzz in Maxwell's stress tensor indicates a force per unit area in the z direction, even when the electric field along z is zero in electrostatics. This component reflects the interaction of the electromagnetic field on opposite sides of a surface, rather than a force acting on a charge distribution. The analogy of a box demonstrates that applying forces in the x and y directions can still create pressure in the z direction on the top and bottom surfaces. This highlights the complexity of electromagnetic forces and their effects in electrostatic conditions. Understanding this concept is crucial for analyzing forces in electromagnetic fields.
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In summary Tzz in maxwells stress tensor represents a force per unit area in the z direction acting on an area element that is oriented along the z direction also why it could be non zero eventhough the electric field along z is zero and I'm talking here in electrostatic
 
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It is not a force on a charge distribution. It is the force of the EM field on one side of the surface acting on the EM field on the other side.
 
Orodruin said:
It is not a force on a charge distribution. It is the force of the EM field on one side of the surface acting on the EM field on the other side.
Can I use the analogy with a box when you apply forces on x and y directions on its sides but not on the top and bottom there will be pressure on the z direction on the top and bottom
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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