This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Prelim2 Practice Answer Key 1. true or false • F, it has to be vector sum. • F, Gauss’ Law gives the net electric field. • F, think about an electron moving inside a capacitor with initial velocity perpendicular to the ~ E field. • F, the flux remains constant. • T • F, the electric potential is constant but not necessarily zero. • F, the charges are on the inner surfaces. • F, with the voltage unchanged and the capacitance decreased, the total charge decreases. • F, the battery near the end of its useful life has the same emf, but a much larger internal resistance. • F, the parallel case has larger power. • T • F, only true if the electric field is uniform. • T 2. C, the two spheres will be at equal potential if connected by a wire. 3. C, 4. C, A, C 5. C, C, B, A (the capacitor has to do work so that the energy stored in it will decrease.) 6. see graphs at the end 7. (a) Inner: Q, Outer: +2Q, (b) The electric field E ( r ) = Q 2 π r 2 , r > 3 R E ( r ) = Q...
View
Full
Document
This note was uploaded on 11/09/2008 for the course PHYS 2213 taught by Professor Perelstein,m during the Fall '07 term at Cornell.
 Fall '07
 PERELSTEIN,M
 Magnetism, Heat

Click to edit the document details