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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


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    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.
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