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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 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
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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