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 Ω Ω . Two resistance of 6 Ω Ω and 3 Ω Ω are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is
Text Solution
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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 
Bil 
(Towards left)
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