Question regarding electromagnetic interaction

  • Thread starter Lory73
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  • #1
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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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  • #2
jtbell
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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:
 
  • #3
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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 ?
 
  • #4
pam
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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.
 
  • #5
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Thanks Pam
 

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