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Magnetic Induction

  1. May 9, 2016 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    I am not really good at this topic, but I think you would need both the right hand rules (one that involves finding direction of current via magnetic field as well as the one for finding magnetic force)

    3. The attempt at a solution
    So I drew out magnetic lines going from the north pole to the south pole. I am completely lost from there though. How does a magnetic bar being pulled away or towards the wire loop play a role? I got that for A and B, the magnetic field lines are pointing downwards into the loop and for C and D the magnetic field are pointing upwards. Am I wrong in this logic?
  2. jcsd
  3. May 10, 2016 #2


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    Have you studied Lenz's law yet?
  4. May 10, 2016 #3
    I figured out how to do the first couple questions using Lenz Law after a lot of reading. However, I still don't know how to relate magnetic force to a circular loop. I get that for A and B, the magnetic field lines are pointing in the loop while for C and D, the field lines are pointing away. How can I find the force from here? I tried to do the right hand rule but it doesn't work
  5. May 10, 2016 #4


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    Force exerted on the magnet will oppose its motion. It is consistent with the Lenz's law.
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