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Homework Help: Induced current in a solenoid

  1. Dec 6, 2016 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    The answer of 2c is : Current through A to the left.
    But I think it is to the right.
    By I=V/R, a reduced resistance R results in an increase of current through solenoid X. By B=unI, an increase in current causes the magnetic flux density to increase(where field lines point right). By lenz's law there will be an induced current in solenoid Y to produce a magnetic field opposite to the increase of magnetic field in X, which points from right to left. By right hand grip rule the current flows from left to right through the ammeter.
    Why am I wrong. Thanks
  2. jcsd
  3. Dec 6, 2016 #2


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    I agree with you. Part c is similar to part a.
  4. Dec 6, 2016 #3


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    Your reasoning sounds correct to me.
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