In Figure P20.63, the rolling axle, 1.50 m long

In Figure P20.63, the rolling axle, 1.50 m long

In Figure P20.63, the rolling axle, 1.50 m long, is pushed along horizontal rails at a constant speed v = 3.00 m/s. A resistor R = 0.400 Ω 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 = 0.800 T is directed vertically downwards.

In Figure P20.63, the rolling axle, 1.50 m long

 

(a) Find the induced current I in the resistor.

(b) What horizontal force is required to keep the axle rolling at constant speed?

(c) Which end of the resistor,a or b, is at the higher electric potential?

(d) After the axle rolls past the resistor, does the current in R reverse direction?

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