A rectangular, a square, a circular and an elliptical loop, all in the XY-plane, are moving out of a uniform magnetic field with a constant velocity 
. The magnetic field is directed along the negative Z-axis direction. The induced emf during the passage of these loops, out of the field region, will not remain constant for
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Induced emf, 
Now, as the square loop and rectangular loop move out of magnetic field, 
is constant, therefore 
is constant. But in case of circular and elliptical loops, 
changes. Therefore, emf does not remain constant.
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