Problem 3 (5 points) Problem 7.7 A metal bar of mass m slides frictionlessly on two parallel conducting rails a distance

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Problem 3 5 Points Problem 7 7 A Metal Bar Of Mass M Slides Frictionlessly On Two Parallel Conducting Rails A Distance 1 (36.57 KiB) Viewed 20 times

Problem 3 (5 points) Problem 7.7 A metal bar of mass m slides frictionlessly on two parallel conducting rails a distance / apart (Fig. 7.17). A resistor R is connected across the rails, and a uniform magnetic field B, pointing into the page, fills the entire region. m FIGURE 7.17 (a) If the bar moves to the right at speed v, what is the current in the resistor? In what direction does it flow? (b) What is the magnetic force on the bar? In what direction? (c) If the bar starts out with speed o at time t = 0, and is left to slide, what is its speed at a later time t? (d) The initial kinetic energy of the bar was, of course, mu?. Check that the en- ergy delivered to the resistor is exactly mv². R wwww