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Unformatted text preview: WebAssign Ch21 HW5 S2010 (Homework) Kiyaniah Tilghman PY 208, section 003M, Spring 2010 Instructor: Keith Weninger Current Score : 10 / 19 Due : Tuesday, March 30, 2010 12:30 PM EDT About this Assignment Extension Requests Question Points 1 2 34 1 4/10 2 3/6 Total 10/19 (52.6%) Description Motional EMF Instructions Reading: Sec. 21.5 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. 1/1 points All Submissions Notes Question: MI3 21.X.076 A neutral copper bar oriented horizontally moves downward through a region where there is a magnetic field out of the page. Which diagram correctly shows the distribution of charge on the bar? 3 3 2. 4/10 points All Submissions Notes Question: MI3 21.X.091 A neutral metal rod of length 0.35 m slides horizontally at a constant speed of 9 m/s on frictionless insulating rails through a region of uniform magnetic field of magnitude 0.5 tesla, directed into the page as shown in the diagram. Before answering the following questions, draw a diagram showing the polarization of the rod, and the direction of the Coulomb electric field inside the rod. Which of the following statements is true? The top of the moving rod is positive. The top of the moving rod is negative. The right side of the moving rod is positive. The right side of the moving rod is negative. The moving rod is not polarized. After the initial transient, what is the magnitude of the net force on a mobile electron inside the rod? | net | = 0 0N What is the magnitude of the electric force on a mobile electron inside the rod? | el | = (No Response) 7.20e-19 N What is the magnitude of the magnetic force on a mobile electron inside the rod? | mag | = (No Response) 7.20e-19 N What is the magnitude of the potential difference across the rod? | V| = (No Response) 1.57 volts In what direction must you exert a force to keep the rod moving at constant speed? To the left No force is needed To the right 3. 2/2 points All Submissions Notes (a) In which direction will conventional current flow through the resistor in the figure? e e (b) What will be the direction of the magnetic force on the moving bar? c 4. c 3/6 points All Submissions Notes Question: MI3 21.P.082 Pull a rectangular loop through a magnetic field In the figure a rectangular loop of wire L = 11 cm long by h = 8 cm high, with a resistance of R = 0.9 ohms, moves with constant speed v = 2 m/s as shown. The moving loop is partially inside a rectangular region where there is a uniform magnetic field (gray area) and partially in a region where the magnetic field is negligibly small. In the gray region, the magnetic field points into the page, and its magnitude is B = 1.5 tesla. (a) Which of the following diagrams correctly shows the charge distribution on the moving loop? A A A B C D E F G (b) What is the direction of the conventional current? clockwise clockwise (c) What is the conventional current in the loop? (No Response) 0.267 A (d) Which of the following are true? Check all that apply. Because a current flows in the loop, there is a magnetic force on the loop. The magnetic force only stretches the loop; the net magnetic force on the loop is zero. The magnetic force on the loop is in the same direction as the velocity of the loop. (e) What is the magnitude of the magnetic force on the loop? (No Response) 0.032 N ...
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