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Homework Help: Please check my reasoning - Lenz's Law

  1. Feb 27, 2007 #1
    1. The problem statement, all variables and given/known dataReview the following drawing.

    The semicircular piece of wire rotates through half a revolution in the direction shown, starting from the position indicated in the drawing. Which end of the resistor, the left or the right end, is positive?
    a. neither -- there is no induced emf
    b. the left end
    c. the right end


    3. The attempt at a solution
    i chose "C. the right end"
    Ok the loop will initially move away from the field as it turns (decreasing the field and flux), but it will then move toward the field increasing it (and the flux) into the page. to oppose this, a field directed out of the page is induced by a Counter Clock-Wise current. Current will flow from negative to positive regions.
  2. jcsd
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