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 = 2m/s is
Motional emf
This acts as a cell of emf and internal resistance .
This simple circuit can be drawn as follows
Current through the connector
magnetic force on connector (Towards left)