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Homework Help: Induced current in a coil

  1. Nov 30, 2009 #1
    1. The problem statement, all variables and given/known data
    P and Q are two coils arranged in parallel to each other and coaxially. Q is connected in series with a cell, a closed switch S and a rheostat. Determine the direction of the current in P when: the switch S is opened.

    2. Relevant equations
    Lenz's Law: The direction of the induced emf is such that it tends to oppose the flux change causing it and does oppose it if an induced current flows.

    3. The attempt at a solution
    A N pole would be present where P is near Q as Q has a N pole near P as the flow of the current in coil Q is anticlockwise. When the switch is opened, the current falls. This is where i'm stuck. Does this mean that the pole in coil P near Q changes? Why? Please explain this
  2. jcsd
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