A rectangular,a square,a circular,and an elli | vedclass

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(A) The induced electromotive force (emf) is given by $\varepsilon = B l v$,where $l$ is the length of the conductor cutting the magnetic field lines

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the circular and the elliptical loops

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(A) The induced electromotive force (emf) is given by $\varepsilon = B l v$,where $l$ is the length of the conductor cutting the magnetic field lines perpendicular to the velocity vector.For a rectangular or square loop,as it moves out of the magnetic field,the length $l$ of the side cutting the magnetic field lines remains constant until the entire loop exits the field. Thus,the induced emf remains constant.For a circular or elliptical loop,the width of the loop perpendicular to the velocity vector changes continuously as the loop moves out of the magnetic field. Since the length $l$ is not constant,the induced emf $\varepsilon = B l v$ will not remain constant.Therefore,the induced emf will not remain constant for the circular and elliptical loops.

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