7. [1 mark] Three conducting loops, $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$, are moving with the same speed from a region of zero magnetic field to a region of uniform non-zero magnetic field. Which loop(s) has/have the largest induced electromotive force (emf) at the instant when the loops enter the magnetic field? A. Z only B. Y only C. $\mathrm{Y}$ and $\mathrm{Z}$ only D. X and Y only

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