Question regarding electromagnetic interaction

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Discussion Overview

The discussion revolves around a question related to electromagnetic interactions, specifically focusing on the behavior of electric fields generated by accelerated electrons and their effects on a positively charged plate. The scope includes theoretical considerations and conceptual clarifications regarding electric field behavior.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant, Lory, seeks confirmation of their understanding regarding the forces acting on a plate due to accelerated electrons.
  • Another participant suggests that sharing Lory's reasoning could lead to either confirmation or critique of their answer.
  • A participant proposes that the plate experiences a downward force due to the acceleration of electrons and questions whether the electric field generated is oscillating or unidirectional.
  • Another participant clarifies that there is a non-oscillating electric field in the direction of the acceleration, which exerts a downward force on the plate, and notes the presence of another electric field that exerts a leftward force, highlighting the differing fall-off rates of these fields.
  • The clarification emphasizes that the charge in question is not oscillating, which would typically generate an oscillating field.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the electric fields generated by the accelerated electrons, with some uncertainty regarding whether the field is oscillating or unidirectional. The discussion remains unresolved as participants explore these concepts.

Contextual Notes

There are unresolved aspects regarding the assumptions about the behavior of electric fields in relation to the acceleration of electrons and the implications for the forces on the plate.

Lory73
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Hello
I attach a question (PDF-file) which I found in an old physics book, I printed the question and re-generated the drawing which were a bit hard to scan.

Can anyone answer the attached question, I think I know the answer but I want to be sure.

Thanks

Lory
 

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Tell us what you think the answer is, and your reasoning, and then we can either confirm it or rip it to shreds. :biggrin:
 
Well, the obvious answer is that the plate experience a force downward.
The thing that puzzles me is whether the accelerated electrons are suppose to generate an ossilating electric field to both diretions (up and down) or a unidirectional electric field due to the fact that they are only accelerated in one direction.

Now, am I right ?
 
There will be a non-oscillating electric field E_a in the direction of the acceleration, exerting a downward force on the positively charged plate, as you say.
There will also be an electric field E_b pointing toward the electron, which would exert a leftward force on the plate. E_a falls off as 1/r, while E_b falls off as 1/r^2, so each will dominate at different distances.
An oscillating charge radiates an oscillating field, but this charge is not oscillating.
 
Thanks Pam
 

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