B Does a hot coffee have bigger mass than a cold coffee?

  • #101
Orodruin said:
Because the electric (and magnetic) field can have other sources than the particles in the bound state in addition to containing the radiation emitted when the bound state formed.
Sorry, I didn't get your point. Which are the other field's sources other than the 2 charged particles ?
 
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  • #102
cianfa72 said:
Sorry, I didn't get your point. Which are the other field's sources other than the 2 charged particles ?
If you have only two particles in the entire universe and they have forever been in a bound state, none.
 
  • #103
Orodruin said:
If you have only two particles in the entire universe and they have forever been in a bound state, none.
You mean that in real universe where there are multiple particles, the current field distribution depends on the two particles in the bound system acting as sources as well on all other charged particles (not included in the two particle's bound system).
 
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