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Homework Help: Radius of a long solenoid

  1. Aug 5, 2009 #1
    1. The problem statement, all variables and given/known data

    For a long solenoid, the magnetic field strength within the solenoid is given by the equation B = 5.0t T, where t is time in seconds. If the induced electric field outside the solenoid is 11 V/m at a distance 2.0m from the axis of the solenoid, find the radius of the solenoid.

    2. Relevant equations

    E_inside = r/2 |dB/dt|

    3. The attempt at a solution

    I know how to calculate the electric field outside the solenoid, but how can I associate the magnetic field inside of it with the electric field outside?
  2. jcsd
  3. Aug 6, 2009 #2


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    Assume that the magnetic flux through the 2.0 m circle extends only over the cross-sectional area of the solenoid.
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