# MP02c - Print View Print PHYS 2212 G/H Spring 2008 MP02c...

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[ Print View ] PHYS 2212 G/H Spring 2008 MP02c Due at 9:00am on Thursday, January 24, 2008 View Grading Details Charge Distributions This assignment will receive a 30% bonus if it is completed before 9:00 AM, Wednesday, January 23. The Electric Field inside a Conductor Learning Goal: To understand how the charges within a conductor respond to an externally applied electric field. To illustrate the behavior of charge inside conductors, consider a long conducting rod that is suspended by insulating strings (see the figure). Assume that the rod is initially electrically neutral, and that it remains so for this discussion. The rod is positioned along the x axis, and an external electric field that points in the positive x direction (to the right) can be applied to the rod and the surrounding region. The atoms in the rod are composed of positive nuclei (indicated by plus signs) and negative electrons (indicated by minus signs). Before application of the electric field, these atoms were distributed evenly throughout the rod. Part A What is the force felt by the electrons and the nuclei in the rod when the external field described in the problem introduction is applied? (Ignore internal fields in the rod for the moment.) Hint A.1 Formula for the force on a charge in an electric field Hint not displayed ANSWER: Both electrons and nuclei experience a force to the right. The nuclei experience a force to the right and the electrons experience a force to the left. The electrons experience a force to the left but the nuclei experience no force. The electrons experience no force but the nuclei experience a force to the right. Part B What is the motion of the negative electrons and positive atomic nuclei caused by the external field? Hint B.1 How to approch this part Hint not displayed Hint B.2 Masses and charges of nuclei and electrons Hint not displayed ANSWER: Both electrons and nuclei move to the right. The nuclei move to the right and the electrons move to the left through equal distances. The electrons move to the left and the nuclei are almost stationary. The electrons are almost stationary and the nuclei move to the right. The nuclei of the atoms of a conducting solid remain almost in their places in the crystal lattice, while the electrons

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## This note was uploaded on 05/08/2008 for the course PHYSICS 2212 taught by Professor N/a during the Spring '08 term at Georgia Tech.

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MP02c - Print View Print PHYS 2212 G/H Spring 2008 MP02c...

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