The armature coil of dynamo is rotating. The generated induced emf varies and the number of magnetic lines of force also varies. Which of the following condition is correct:- 

A conducting square loop of side $\mathcal{l}$ and resistance R moves in its plane with a uniform velocity perpendicular to one of its sides. A uniform and constant magnetic field B exists along the perpendicular to the plane of the loop as shown in the figure. The current induced in the loop is :- 
                      

For given arrangement (in horizontal plane) the possible direction of magnetic field

In this given figure if magnetic field increases with time then pattern of induced electric field lines will be :-

As a result of change in the magnetic flux linked to the closed loop shown in the figure, an e.m.f. $V$ volt is induced in the loop. The work done (joules in taking a charge $Q$ coulomb once along the loop is