(i) The sides AD and BC are parallel to V. Hence no emf in induced in them. For the side CD, moving in the field,
(ii) As the whole frame in moving through the field from time t1 to t2 say the flux through the frame is constant. Hence there is no induced current during this interval. [Alternatively the induced emf in the arms AB and CD are in opposite directions, the resultant emf in the frame is zero.]
(iii) When CD just moves out of the field region, on the other side, the magnitude of the induced emf, in AB, moving through the field, is again equal to 2 x 10-4 V. Hence magnitude of induced current, in the frame, is same, but its direction is now opposite to that in the first case (The flux is now decreasing with time). The required sketches, therefore, have the forms shown.