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Question about induced e.m.f

  1. May 21, 2015 #1
    IMG_2589.JPG 1. The problem statement, all variables and given/known data
    Based on what i've got, i guess the answer is A. However, I'm not quite sure of myself.
    From what I can see coil Y has its own magnetic field because current is flowing in that coil. When theres a flow of current there will be a magnetic field around it. Thus, placing coil Y close to coil X will produce induced e.m.f on coil X.

    The main problem here is how to determine the direction of current flow in coil X ?

    well, please correct me if my theory was incorrect
    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. May 21, 2015 #2

    BvU

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    Hi Z,

    You are searching in the right direction and now need something to go by: an equation perhaps ? Could you post the most relevant ?
    What determines the induced emf ? And its polarity ?
     
  4. May 21, 2015 #3
    i've checked the answer just now, guess what, the right answer is B :D
    Would you care to help me find the reason why is this
    I just don't get it
     
  5. May 21, 2015 #4

    BvU

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    Well, I tried to help in post #2. THe questions still stand!

    Approaching from the other end: what happens when the switch is opened ?
     
  6. May 21, 2015 #5
    I'm still trying to figure out what happens when the switch is opened. lol
     
  7. May 21, 2015 #6

    BvU

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    Well, you already said it in so many words:
    and what happens to current when that switch opens ?

    Oh, the questions from post # 2 Are still open :smile: !
     
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