Electric force with a moving conductive bar in a magnetic field

  1. 1. The problem statement, all variables and given/known data
    A conducting bar is moved to the right in a magnetic field going into the page, an electric field is set up in the bar. Is this electric field upwards or downwards.

    3. The attempt at a solution
    i think that because a current is being induced in the bar you use the right hand rule but the current goes the other way in the thumb therefore the electric field is up the bar. Is this correct?
     
  2. jcsd
  3. Andrew Mason

    Andrew Mason 6,858
    Science Advisor
    Homework Helper

    The electric field is given by:

    [tex]\vec{E} = \vec{v} \times \vec{B}[/tex]

    So use the right hand rule for cross product (use the index finger for v and the middle finger for B and the thumb will give the direction of E).

    AM
     
  4. is that a yes, by the way i think you misunderstood, i use the right hand palm rule, not the flemming thing.
     
  5. Andrew Mason

    Andrew Mason 6,858
    Science Advisor
    Homework Helper

    If you use the right hand two-finger-thumb rule to determine cross product, you will not be confused.

    AM
     
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