Figure 27.39 shows a pair of parallel conducting rails a distance l apart in a uniform magnetic field B(vector). A resistor R is connected across the rails, and a conducting bar of negligible resistance is being pulled along the rails with velocity v ! to the right.(a) What direction is the current in the resistor?(b) At what rate does the agent pulling the bar do work?

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В х хх х_х x x x X x x X .R FIGURE 27.39 Problems 46-49 and 75