MCQ
A rectangular loop with a sliding connector of length $l=1.0 \mathrm{~m}$ is situated in a uniform magnetic field $B=2 T$ perpendicular to the plane of loop. Resistance of connector is $r=2 \Omega$. Two resistance of $6 \Omega$ and $3 \Omega$ are connected as shown in figure. The external force required to keep the connector moving with a constant velocity $v=$ $2 \mathrm{~m} / \mathrm{s}$ is
- A$6 \mathrm{~N}$
- B$4 N$
- ✓$2 N$
- D$1 N$