hw7 - Solution for Homework 7 Conductors and Dielectrics...

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Unformatted text preview: Solution for Homework 7 Conductors and Dielectrics Solution to Homework Problem 7.1(Electric Field Outside of a Material in a High Symmetry System) Problem: If a conductor is uncharged and placed in one of the high symmetry systems (planar, spherical, or cylindrical) and has the same symmetry of the system, how is the electric field outside of the conductor changed? Select One of the Following: (a) The field outside is reduced to zero. (b) The field outside is changed in a way that depends on the shape of the conductor. (c-Answer) The field outside is unchanged. Solution Outside of an uncharged conductor or dielectric in the high symmetry (Gauss’ Law) system, the field is unchanged. Total Points for Problem: 2 Points Solution to Homework Problem 7.2(How is Field Reduced in a Conductor?) Problem: Which of the following best describes how a conductor lowers the electric field in its interior? Select One of the Following: (a) Electric field lines cannot penetrate conducting atoms. (b) A conductor does not allow field lines through its surface. (c) The electric field causes a continuous flow of charge which upsets the field. (d-Answer) A surface charge is set up that creates an electric field which cancels the applied field. Solution (d): Charge moves to the surface of a conductor creating a net zero field inside. Total Points for Problem: 2 Points Solution to Homework Problem 7.3(Field inside Conductor) Problem: I place q = 3 μ C of charge on a solid copper metal marble with a radius of 3 cm. What is the electric field inside the marble? Select One of the Following: (a) 2 . 7 × 10 4 N C (b-Answer) 0 (c) 256 N C (d) Cannot be determined 1 Solution The field inside a conductor is zero. Total Points for Problem: 3 Points Solution to Homework Problem 7.4(Why perpendicular to surface?) Problem: Why must the electric field be perpendicular to the surface of a conductor? Select One of the Following: (a) To make the electric field in the conductor zero. (b) Because the electric field is independent of path. (c-Answer) Otherwise there would be a component of the electric field along the surface and a surface current would flow....
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This homework help was uploaded on 04/19/2008 for the course PHYS 2074 taught by Professor Stewart during the Spring '08 term at Arkansas.

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hw7 - Solution for Homework 7 Conductors and Dielectrics...

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