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Velocity in a magnetic field

  1. Dec 14, 2008 #1
    1. The problem statement, all variables and given/known data
    Two parallel conducting rails are separated by 50 cm. These are connected together
    by a fixed wire and by a third rail, constrained to lie transverse to the two parallel rails,
    which can slide back and forth. There is a 100 ohm resistance in the fixed wire. All three rails lie in the xy-plane, in the presence of a magnetic field B = 10 μT k(direction vector). What velocity must one slide the rail in order to generate a current of 1 μA?


    2. Relevant equations
    V=IR
    F=q(E+vxB)


    3. The attempt at a solution
    A current of 1 μA and resistance of 100 ohm means that the voltage should be 1x10-3 V. What should I do next?
     
  2. jcsd
  3. Dec 15, 2008 #2

    rl.bhat

    User Avatar
    Homework Helper

    A current of 1 μA and resistance of 100 ohm means that the voltage should be 1x10-3 V
    Micro means 10^-6.
    Induced emf = rate of change of flux. And flux = field*area
     
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