Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Accelerating electrons giving off radiation

  1. Sep 9, 2010 #1
    Since the electrons flowing around a superconducting ring are accelerating they should give off electromagnetic radiation.
    Based on this, is there any easy way to estimate the half-life of a supercurrent given the radius of the ring?

    even a back of the envelope order of magnitude kind of thing is fine.
    Last edited: Sep 9, 2010
  2. jcsd
  3. Sep 9, 2010 #2
    I think the Larmor formula is what you're looking for (http://en.wikipedia.org/wiki/Larmor_formula). Note, however, it only applies to the non-relativistic case. I think the article shows a basic derivation, you might be able to generalize to the relativistic case; otherwise you'd have to work from maxwell's equations.
  4. Sep 9, 2010 #3
    the electrons in the superconductor are moving slowly arent they?
  5. Sep 9, 2010 #4
    basically its proportianal to a2
  6. Sep 9, 2010 #5
    Last edited: Sep 9, 2010
  7. Sep 9, 2010 #6
    It depends on the case; they can be moving essentially arbitrarily fast... depends on the situation.

    Absolutely, and thats generally the case (at least for non-relativistic situations).

    It wouldn't apply well to a normal conductor, but for a superconductor it should be fine.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook