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Tricky wording in electrical circuits question

  1. Jul 3, 2012 #1
    1. The problem statement, all variables and given/known data

    2gxjs5e.jpg

    2. Relevant equations



    3. The attempt at a solution

    When it says, without changing the circuit, does it mean adding something else that is extra or does that mean i have to solve it without closing the switch?
     
  2. jcsd
  3. Jul 3, 2012 #2

    ehild

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    Gold Member

    The switch belongs to the circuit and you can use it.

    ehild
     
  4. Jul 3, 2012 #3
    What will happen when you
    a) close the switch
    b) open the switch ?
     
  5. Jul 3, 2012 #4

    CWatters

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    Remember that what makes dynamos and motors work is changing flux not constant flux.
     
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