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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. 7 See, for example, W. M. Saslow, Am. J. Phys., 60, 693 (1992). 7.1 Electromotive Force R ww m บ 311 FIGURE 7.17 (a) If the bar moves to the right at speed u, 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 vo 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, 1/2mvo². Check that the en- ergy delivered to the resistor is exactly 1½-mvo².

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. 7 See, for example, W. M. Saslow, Am. J. Phys., 60, 693 (1992). 7.1 Electromotive Force R ww m บ 311 FIGURE 7.17 (a) If the bar moves to the right at speed u, 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 vo 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, 1/2mvo². Check that the en- ergy delivered to the resistor is exactly 1½-mvo².

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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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. 7 See, for example, W. M. Saslow, Am. J. Phys., 60, 693 (1992). 7.1 Electromotive Force R ww m บ 311 FIGURE 7.17 (a) If the bar moves to the right at speed u, 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 vo 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, 1/2mvo². Check that the en- ergy delivered to the resistor is exactly 1½-mvo².
Transcribed Image Text: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. 7 See, for example, W. M. Saslow, Am. J. Phys., 60, 693 (1992). 7.1 Electromotive Force R ww m บ 311 FIGURE 7.17 (a) If the bar moves to the right at speed u, 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 vo 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, 1/2mvo². Check that the en- ergy delivered to the resistor is exactly 1½-mvo².
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