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Electromagnetic Induction

  1. Apr 8, 2016 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    Not really? I just used the right hand rule and Lenz's law

    3. The attempt at a solution

    By the right hand rule, outside of loop 1, the magnetic field is out of the page. However, increasing resistance means that field is weakening. We know by Lenz's law that loop 2 will try to replace that field, so outside of loop two should be an out of the page magnetic field. This means the current direction is Clockwise, giving choice B

    However, the answer is choice A. Why?
  2. jcsd
  3. Apr 9, 2016 #2


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    Magnetic flux from the left loop will be linked with the right loop. What is the direction of field in the right loop because of the current flowing through the left loop? Since the current in the left loop is decreasing, to maintain the previous direction(and magnitude) of the field, current will flow through the right loop.
  4. Apr 10, 2016 #3
    Wouldn't the field be out of the page because outside of the left ring, the field is out of the page?
  5. Apr 10, 2016 #4


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    Yes. But if that field is collapsing, in what direction should the current flow in order to resist this "change"?
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