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Homework Help: Calculating speed needed to create motional EMF of given magnitude

  1. Apr 9, 2010 #1
    1. How fast would you have to drive your car to create a 3.0 V motional emf along your 1.2 m-long radio antenna? Assume that the motion of the antenna is perpendicular to B.

    2. d(phi)/dt = EMF
    dphi = B*A
    v = dx/dt

    3. I'm really not sure here. I think the length of the antenna will be dx, but I don't see how I'd get dt so solve for velocity. In a previous problem, worked out a minimum speed needed to create an EMF by using dphi = B*A = EMF*dt. But here I don't know B or A...
  2. jcsd
  3. Apr 9, 2010 #2
    Nevermind, I just overlooked the simple EMF = vlB relationship.
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