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Bar moving in a magnetic field.

  1. Sep 28, 2013 #1
    I have attached a copy of the question I am having issues with, I can't seem to figure out the equation I have to use to solve this. My lecturer did an example of this but for some reason I can't find it anywhere.
     

    Attached Files:

  2. jcsd
  3. Sep 29, 2013 #2

    Simon Bridge

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    If you cannot figure out the equation - use physics instead, and derive the equation.
    What is happening, mechanically and electrically, in the problem?
    What sort of law will apply here?
     
  4. Sep 29, 2013 #3
    I think I solved the problem. Emf = BLV. And we know that emf will be equal to IR when the current is 0.5A.

    0.5 x 9 = 4 x 1.2 x V

    Therefore the velocity equals 0.9375 m/s.

    Is this correct?
     
  5. Sep 29, 2013 #4

    Simon Bridge

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  6. Sep 29, 2013 #5

    rude man

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    Yes.
    Good.
    Using Blv works even when Maxwell's equations don't!
     
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