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Magnetic Fields Shrinking Radius Help Please

  1. Mar 19, 2008 #1
    1. The problem statement, all variables and given/known data
    An elastic conducting material is stretched into a circular loop of 20.0 cm radius. It is placed with its plane perpendicular to a uniform 0.900 T magnetic field. When released, the radius of the loop starts to shrink at an instantaneous rate of 78.0 cm/s. What emf is induced in the loop at that instant?

    2. Relevant equations

    3. The attempt at a solution
    I am very lost in this section. Any help would be appreciated....just a starting point please! Thanks
  2. jcsd
  3. Mar 19, 2008 #2
    What is the definition of flux? How does EMF relate to flux?
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