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

Homework Help: How does a loop of wire in a generator produce alternating current?

  1. May 27, 2008 #1
    a.by creating current by rotating in an existing magnetic field?
    b.by creating a varying magnetic field with its rotational kinetic energy
    c.by rotating through areas of high and low electrical force

    An electric field produces a magnetic field even when there is no wire to conduct a current provided which of the following is also true?

    a.The electric field is between a pair of parallel metal plates.
    b.The electric field changes in time but at each instant is the same at every location.
    c.The electric field is changing as time passes.
    d.The electric field is different from place to place.
    e.The electric field does not change as time passes.
  2. jcsd
  3. May 27, 2008 #2
    It might help if you post some of your thoughts. For the first problem, consider the implications of Faraday's Law. For the second problem, consider Maxwell's extension to Ampere's Law (or Ampere's circuital law as it's named in this link): http://en.wikipedia.org/wiki/Maxwell's_equations

    What's happening to the electric field E in this equation?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook