In the following graph the change of magnetic flux between $t=0$ to $t=3 \mathrm{s}$ is

A straight conductor $PQ$ is moving in a uniform and time independent magnetic field $\left(B\right)$ as shown in figure. The motional emf is equal to [where $v$ is velocity of rod]

The variation of magnetic flux with time is shown. The variation of induced emf with time is shown as

If the rod $PQ$ rotates with angular speed $\omega$ about its mid-point $\left(M\right),$ and magnetic field $\overrightarrow{B}$ is out of the plane of motion, then emf induced between ends $PQ$ will be ($PQ$ is the length of rod)