Magnetic Fields Shrinking Radius

AI Thread Summary
An elastic conducting loop with a radius of 20.0 cm is placed in a 0.900 T magnetic field and begins to shrink at a rate of 78.0 cm/s. To determine the induced electromotive force (emf) in the loop, one must understand the relationship between magnetic flux and emf. Magnetic flux is defined as the product of the magnetic field and the area through which it passes. The induced emf can be calculated using Faraday's law, which relates the rate of change of magnetic flux to the induced emf. Clarification on these concepts will aid in solving the problem.
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Homework Statement


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?


Homework Equations





The Attempt at a Solution


I am very lost in this section. Any help would be appreciated...just a starting point please! Thanks
 
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