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Magnetic field question? is this correct?

  1. Jun 27, 2012 #1
    1. The problem statement, all variables and given/known data

    The conductive bar CD with a length of 20 cm and resistance R, moves with speed v=5 m/s. The magnetic field is perpendicular with the plan and the induction is B=2 T.
    The mass of the object in the figure is m=80 grams and g=10 m/ s^2
    a) find the direction and the intensity of the induced current that moves in CD
    b) The resistance of this bar


    2. Relevant equations

    http://s1171.photobucket.com/albums/r549/Elaia06/?action=view&current=hrtfg.jpg

    3. The attempt at a solution

    the resultant force on the bar is zero.This means the only force acting on the bar is the magnetic force F=B*i*l.
    Now we have the Tension= mg-ma but acceleration is zero so we write
    Magnetic force = Force on the string
    B*i*l=m*g
    I know how to solve this now
    The magnetic force will have the direction <---- based on the figure and the induced current the direction from left to right .
     
  2. jcsd
  3. Jun 27, 2012 #2

    tiny-tim

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