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Homework Help: Lenz's Law: rectangle and wire

  1. Mar 23, 2014 #1
    1. The problem statement, all variables and given/known data

    A metal rectangle is close to a long straight current carrying wire, with 2 sides parallel to the wire. If the current in the wire is decreasing, the rectangle is

    2. Relevant equations
    Lenz's Law: the direction of any magnetic induction effect is such to oppose the cause of the effect

    3. The attempt at a solution
    The field of the wire is decreasing; therefore, the current through the wire is travelling in the same direction. If current is moving in the same direction, the wires attract each other. I feel like I am missing something.
  2. jcsd
  3. Mar 23, 2014 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    I don't understand what you are saying. The wire current is in the same direction as what?

    For the rectangle, the current travels around in a loop. So, current in two opposite sides of the rectangle must travel in opposite directions. They cannot both be in the same direction. (I'm not sure if this helps your understanding any.)
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