The magnetic field in a region is given by \[\overrightarrow{B}=B_{0}\left( 1+\frac{x}{a} \right)\hat{k}\] . A square loop of edge - length d is placed with its edge along x & y axis. The loop is moved with constant velocity \[\overrightarrow{V}=V_{0}\hat{i}\]. The emf induced in the loop is

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