Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped

Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance `1Omega//m`. Position of the conducting rod at `t=0` is shown. A time dependent magnetic field `B=2t` tesla is switched on at `t=0` The current in the loop at `t=0` due to induced emf is