A rectangular loop with a sliding connector of length l =1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r=2 . Two resistance of 6 and 3 are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2 m/s is
Motional emf
This acts as a cell of emf = 4V and internal resistance r = 2.
This simple circuit can be drawn as follows
Current through the connector
Magnetic force on connector
(Towards left)