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HW-5 (1) - 24 03 2013 HW 5 Phys-102 General Physics II HW-5...

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24 03 2013 HW-5 session.masteringphysics.com/myct/assignmentPrintView?assignmentID=2252604 1/19 HW-5 Due: 7:00am on Saturday, March 30, 2013 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy Video Tutor: Magnet and Electron Beam First, launch the video below. You will be asked to use your knowledge of physics to predict the outcome of an experiment. Then, close the video window and answer the question at right. You can watch the video again at any point. Part A The figure shows the path of a charged particle moving in a magnetic field directed into the screen. What is the particle’s charge? Hint 1. How to approach the problem. This problem asks you to apply the concepts of circular motion and of the magnetic force on a moving charge. Given that the particle moves in a circle, what must be the direction of the force exerted on it by the magnetic field? Once you know that, you can use the right-hand rule to determine the charge of the particle. ANSWER: Phys-102 General Physics - II HW-5 Resources Signed in as Hilal Öztürk Help Close
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24 03 2013 HW-5 session.masteringphysics.com/myct/assignmentPrintView?assignmentID=2252604 2/19 Correct A negative charge gives the correct direction for the centripetal force . Exercise 27.10 A flat, square surface with side length 3.15 is in the -plane at . Part A Calculate the magnitude of the flux through this surface produced by a magnetic field 0.225 0.350 0.450 . Express your answer with the appropriate units. ANSWER: Correct A Conductor Moving in a Magnetic Field A metal cube with sides of length is moving at velocity across a uniform magnetic field . The cube is oriented so that four of its edges are parallel to its direction of motion (i.e., the normal vector of two faces are parallel to the direction of motion). negative positive neutral = 4.47×10 −4
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24 03 2013 HW-5 session.masteringphysics.com/myct/assignmentPrintView?assignmentID=2252604 3/19 Part A Find , the electric field inside the cube. Express the electric field in terms of , , and unit vectors ( , , and/or ). Hint 1. Net force on charges in a conductor Electrons in a conductor are more or less free to move within the conductor. As a result electrons in a conductor placed in an electric field (with no magnetic field present) will move until the electic field that they generate inside the conductor cancels the applied field (i.e., until the net internal electric field equals zero). In general, the charges in a conductor move until the net force on them is zero. This happens almost instantaneously in a good conductor. In this problem, there is no external electric field but there is a force on the electrons due to the applied magnetic field. The electrons will thus move in such a way as to create an electric field that will cancel the magnetic force on them (leaving a net force of zero on the electrons).
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