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Negative Voltage Using Faraday's Law

  1. Apr 13, 2010 #1

    FeDeX_LaTeX

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    Gold Member

    Hello;

    When we use Faraday's Law we can get a negative voltage as a result. What does this mean? I'm guessing it means voltage in the other direction?

    Thanks.
     
  2. jcsd
  3. Apr 13, 2010 #2
    No it does not mean like that. The minus sign indicates that the induced voltage in the loop tends to oppose any change of magnetic flux in the loop. For memory aid you can make humor of this fact thinking induced emf as an ungrateful fellow who after being created wants to oppose its creator- the magnetic fux.
    Faraday's law says nothing about the direction of voltage ( actually direction of current) in the loop. So don't worry about the direction of current in the loop while studying Faraday's law.
    To find out the direction of the current in the loop you will need to study Lenz's law.
     
  4. Apr 13, 2010 #3

    FeDeX_LaTeX

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    Gold Member

    Thanks, I get it.
     
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