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**Unformatted text preview: **9/25/08 4:17 PM MasteringPhysics Page 1 of 12 http://session.masteringphysics.com/myct Assignment Display Mode: View Printable Answers Physys 202 Fall08 HW2 Due at 11:00pm on Wednesday, September 24, 2008 View Grading Details Charge Distribution on a Conductor with a Cavity Description: Conceptual problem. Positive charge sits outside a conducting shell. What is the resulting charge distribution on the inside and outside of the shell. A positive charge is brought close to a fixed neutral conductor that has a cavity. The cavity is neutral; that is, there is no net charge inside the cavity. Part A Which of the figures best represents the charge distribution on the inner and outer walls of the conductor? Hint A.1 Conductors have no internal field At steady state, conductors have no internal electric field (otherwise, charge would flow). Therefore, the arrangement of charges on the surfaces of the conductor must exactly cancel out any external electric field to ensure that the internal field is zero. Hint A.2 Charges on the cavity walls Think about what the answer would be for a conductor without a cavity. Would there be net charges on the surface of some imaginary sphere drawn inside of the conductor? Would this change if you removed all of the material inside of that sphere? ANSWER: 1 2 3 Problem 22.48 Description: An extremely long, solid nonconducting cylinder has a radius R_0. The charge density within the cylinder is a function of the distance R from the axis, given by rho_E ( R ) = rho_0 ( (R/R_0 ) )^2, rho_0>0. (a) What is the magnitude of the electric. .. An extremely long, solid nonconducting cylinder has a radius . The charge density within the cylinder is a function of the distance from the axis, given by , . Part A What is the magnitude of the electric field everywhere inside the cylinder (far away from the ends) in terms of and ? Express your answer in terms of the variables , , , and appropriate constants. ANSWER: = Part B [ 9/25/08 4:17 PM MasteringPhysics Page 2 of 12 http://session.masteringphysics.com/myct What is the direction of the electric field everywhere inside the cylinder (far away from the ends) in terms of and ? ANSWER: radially inward radially outward Part C What is the magnitude of the electric field everywhere outside the cylinder (far away from the ends) in terms of and ? Express your answer in terms of the variables , , , and appropriate constants. ANSWER: = Part D What is the direction of the electric field everywhere outside the cylinder (far away from the ends) in terms of and ? ANSWER: radially inward radially outward Electric Force and Potential: Spherical Symmetry Description: Reviews the electric field and potential for a point charge in three dimenions. First asks the student for a formula, then to choose the correct curves from a plot. ...

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