EM Field Angular Momentum Emission Without Emitting Energy?

  • #1
113
4
To radiate energy, the Poynting vector must not drop faster than with the inverse square of the distance. Under what circumstances can EM angular momentum be emitted to the vacuum of space (i.e. without being recovered via inductive coupling) and yet not lead to energy losses through radiation? Is it possible?

Sincerely,

Kevin M.
 
  • Like
Likes ORF and Delta2

Answers and Replies

  • #2
1,225
75
Say there is a magnet. We bring charge from infinite distance and put it on magnet. Magnetic field give Lorentz force to the charge so we give torque to the field. Thus angular moment is put to electromagnetic field. This is an absorption not a emission but the reverse process, i.e. discharge from charged magnet might be of your interest. Best regards.
 
  • #3
Delta2
Homework Helper
Insights Author
Gold Member
3,215
1,185
I am not sure at all here, but thinking in terms of photons, its like you want a photon to possess momentum but not energy which simply is not possible.
 
  • Like
Likes vanhees71
  • #4
ORF
155
14
Hello

Well... I don't want to full your head with hot air (my mother-language is not English, I don't know if the idiom is correct), but you may take a look to this
https://en.wikipedia.org/wiki/Unruh_effect

Unruh derived the effect assuming linear acceleration; I think that it is still correct for centripetal.

Greetings.
 

Related Threads on EM Field Angular Momentum Emission Without Emitting Energy?

Replies
8
Views
5K
Replies
13
Views
7K
Replies
4
Views
617
Replies
7
Views
5K
Replies
4
Views
6K
  • Last Post
Replies
17
Views
3K
Replies
3
Views
2K
Replies
3
Views
1K
Replies
19
Views
8K
Top