problem24_76

# University Physics with Modern Physics with Mastering Physics (11th Edition)

This preview shows page 1. Sign up to view the full content.

24.76: a) The force between the two parallel plates is: . 2 2 2 ) ( 2 2 2 2 0 0 2 2 2 2 0 0 2 0 2 0 z AV ε A ε V z A ε A ε CV A ε q ε qE F = = = = = = b) When , 0 = V the separation is just . 0 z So: . 0 4 2 2 2 ) ( 4 2 0 0 2 3 2 2 0 0 4 = + - = - = k AV ε z z z z AV ε z z k F springs c) For V, 120 and N/m, 25 m, 10 2 . 1 , m 300 . 0 3 0 2 = = × = = - V k z A mm. 1.014 mm, 537 . 0 0 m 10 82 . 3 m) 10 4 . 2 ( 2 3 10 2 3 3 = = × + × - - - z z z d) Stable equilibrium occurs if a slight displacement from equilibrium yields a force back toward the equilibrium point. If one evaluates the forces at small
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: displacements from the equilibrium positions above, the 1.014 mm separation is seen to be stable, but not the 0.537 mm separation....
View Full Document

## This document was uploaded on 04/20/2008.

Ask a homework question - tutors are online