This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Problem 1.4 (10 points). The system analyzed in Problem 1.3 (two thin, parallel, oppositely charged planes) is now placed inside an external, uniform, normal electric field E ext = / see Fig. on the right. Find the forces (per unit area) acting on each plane, by two methods: (i) directly from the electric field distribution, and (ii) from the potential energy of the system. Problem 1.5 (10 points). . (i) By a direct calculation, find the average electric potential of the spherical surface of radius R , created by a point charge q located at distance r > R from the spheres center. (ii) Use the result to prove the following general mean value theorem : The electric potential at any point is always equal to its average value on any spherical surface with the center at that point, and containing no electric charges inside it. d t ext E...
View
Full
Document
This note was uploaded on 09/10/2011 for the course PHY 505 taught by Professor Stephens,p during the Fall '08 term at SUNY Stony Brook.
 Fall '08
 Stephens,P
 Charge, Work

Click to edit the document details