A circular conducting loop of Radius  $\text{'}{r}_o\text{'}$  and having resistance per unit length  $\text{'}\lambda \text{'}$  as shown in the figure is placed in a magnetic field  $B$  which is constant in space and time. The ends of the loop are crossed and pulled in opposite directions with a velocity $\text{'}v\text{'}$  such that the loop always remains circular and the radius of the loop goes on decreasing then