A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure Two resistors R1 and R2 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 v.The correct statement about the directions of induced currents I1 and I2 flowing through R1 and R2 respectively is :