A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure .

Two resistors  $R_1$ and  $R_2$ are connected across the ends of the rails. There is a uniform magnetic field  $\overrightarrow{B}$ pointing into the page. An external agent pulls the bar to the left at a constant speed .The correct statement about the directions of induced currents  $I_1$ and $I_2$  flowing through $R_1$  and  $R_2$ respectively is: