In the figure attached below, the rolling axle, 1.50 m long, is pushed along horizontal rails at a constant speed u = 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, and so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R.) There is a uniform magnetic field B= 0.0800 T vertically downward.(adsbygoogle = window.adsbygoogle || []).push({});

a)Find the induced current I in the resistor.

b)What horizontal force F 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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# Homework Help: Induced Voltages and Inductance

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