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A rectangular, a square , a circular and an elliptical loop, all in the `(x-y)` plane, are moving out of a uniform magnetic field with a constant velocity `vec(v)=vhati` . 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 :

A

any of the four loops

B

the circular and elliptical loops

C

the rectangular, circular and elliptical loops

D

only the elliptical loops

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