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Homework Help: Solenoid physics homework

  1. Apr 25, 2008 #1
    1. The problem statement, all variables and given/known data
    A small 2.0-mm-diameter circular loop with R = 0.020 Ohms is at the center of a large 100-mm-diameter circular loop. Both loops lie in the same plane. The current in the outer loop changes from +1.0 A to -1.0 A in 0.10 s. What is the induced current in the inner loop?

    2. Relevant equations
    [tex]\epsilon = \frac{\delta \Phi}{\delta t}[/tex]

    3. The attempt at a solution

    I'm not sure how to relate [tex]\frac{\delta I}{\delta t}[/tex] to Lenz's Law. Just a hint would be great.
    Last edited: Apr 25, 2008
  2. jcsd
  3. Apr 26, 2008 #2


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    Homework Helper
    Gold Member

    For there to be an induced emf in the inner loop, there must be a changing magnetic flux through the loop. What is causing this magnetic flux?
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