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

Question on electrical induction

  1. Nov 6, 2007 #1
    A changing magnetic field induces a circulating current in a wire loop.
    My question is: Does the changing magnetic field also induce a current in a straight wire?
  2. jcsd
  3. Nov 6, 2007 #2


    User Avatar
    Science Advisor
    Gold Member

    That's a subtle question. If you mean a short straight wire that's not connected to anything, then the answer is no because an emf is induced proportional to the change in enclosed magnetic flux and there's no loop here. But as soon as you try to measure the emf at the wire ends, you create a loop and now you can induce an emf and, depending on the circuit, could have a current.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook