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Homework Help: Induced EMF

  1. Mar 18, 2009 #1
    1. The problem statement, all variables and given/known data

    A 11.2m long steel been is dropped from a height of 9.51m. The horizontal component of the earth's over the region is 18.5x10^-6T. What's the emf in the beam impact just before the impact with the earth, assuming its long dimension remains in a horizontal plane, oriented perpendicularly to the horizontal component of the earth's magnetic field?

    2. Relevant equations
    e= mag flx/t

    3. The attempt at a solution
    A= 1/2*b*h
    A=1/2 x 11.2 x9.51= 53.36

    18.5e-6* 53.26
    but theres no time
  2. jcsd
  3. Mar 18, 2009 #2


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    Staff Emeritus
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    Homework Helper

    That would be the area of a triangle, but I fail to see the relevance???

    My own hunch is that the electric and magnetic forces on a test charge Q in the beam would have to be equal in magnitude, opposite in direction.

    So, what is the magnetic force on a charge Q?
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