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

Why derive electric field produced by a rod?

  1. Sep 15, 2010 #1
    Is there a practical utility to derive the electric field produced by a charged rod (and the 1/r dependence at great distance)? I know it can be useful to derive the electric field produced by a large plate since you can then show that the field between close parallel plates that are oppositely charged is uniform, which is useful info for experimenters.
  2. jcsd
  3. Sep 15, 2010 #2
    What is the electric field 50 feet below a 700 kV interstate high-voltage power line (= long rod)? (ac power lines are actually 3 phase).

    What is the minimum diameter of a high voltage power line to prevent corona?

    Bob S
  4. Sep 15, 2010 #3
    I meant the electric field produced by a static charge on a rod, not the intensity of the electric field in the radiation produced by the ac current in a wire (which is 1/r dependent too).
  5. Sep 15, 2010 #4
    At 50 or 60 Hz, the radiation (like from antenna) is minimal, so the power line problem becomes quasi-electrostatic. The high-tension power line hazard is the quasi-electrostatic field, not a radiation field.

    Bob S
  6. Sep 16, 2010 #5
    Thank you for your help. Do you have any reference about this?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook