Let it go

A rectangular loop with a sliding connector of length "1 m" is situated in a uniform magnetic field of "2 T" perpendicular to the plane of loop. Resistance of connector is 2 $\Omega$ . Two resistances of 6 $\Omega$ and 3 $\Omega$ are connected as shown in the figure. The external force required to keep the connector moving with a constant velocity $2 \frac { m }{ s }$ is $\text{\_\_\_\_\_\_\_\_\_\_\_}$ .