Current Electricity and Electrical InstrumentHard
Question
In figure the rolling axle, of length l is pushed along horizontal rails at a constant speed v. A resistor R is connected to the rails at points a and b, directly opposite each other. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B is vertically downward. Mark the CORRECT statement(s)
Options
A.The induced current I in the resistor is 
B.Horizontal force F is required to keep the axle rolling at constant speed is 
C.End of the resistor, a is at the higher electric potential than b.
D.After the axle rolls past the resistor, the current in R reverse direction.
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