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Homework Help: Electromagnetic induction

  1. Oct 5, 2011 #1
    1. The problem statement, all variables and given/known data

    If I take a magnet and drop it though coil then the graph would have an increasing voltage until a maximum and then a reducing emf (until 0) and then a further reducing emf until a minimum and then an increasing emf again

    graph looks like this: http://www.djb.co.uk/Graphics/Physics/Teachers/magnet.gif

    Remember the magnet remains wholy in the coil for several seconds.

    Questions:
    1) why does the EMF gradually increase then decrease until 0 then decrease further and then increase again??


    2) if the magnet remained wholly in the coil for a while will any voltage be induced? why?

    2. Relevant equations

    no questions

    3. The attempt at a solution
    1) well if the magnet falls straight through the polarity changes but this also confuses me. how can it change if the magnet is falling through without chaging direction?
     
  2. jcsd
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