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Metal frame moved through uniform magnetic field

  1. Jan 25, 2010 #1
    A square rigid metal frame PQRS, of side 12 cm, forms a closed circuit with an ammeter. It is moved through an enclosed region of uniform magnetic field of flux density 2.0 × 10–2 T, from left to right. The field is confined to this area and directed into the page.

    PQRS --> magnetic field -->

    Give the direction of the current through the ammeter when enterting, in the middle, and leaving:

    1. entering: anti clockwise
    2. middle: no current (not cutting any lines of flux)
    3. leaving: clockwise

    How do we determine the direction of the current? I cannot do this using Flemings Left Hand rule?
     
  2. jcsd
  3. Jan 6, 2016 #2
    Lenz's Law.
     
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