question_answer

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, \[\vec{v}=v\hat{i}\]. 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        [AIPMT (S) 2009]

A)  the rectangular, circular and elliptical loops

B)  the circular and the elliptical loops

C)  only the elliptical loop

D)  any of the four loops