PHYA22 Chapter 27.doc

4 Pages

Physics and Astrophysics
Course Code
Brian Wilson

This preview shows page 1. Sign up to view the full 4 pages of the document.
Chapter 27 The Electric FieldElectric Field ModelsFour Widely Used Electric Field ModelsoThe electric field of a point chargeoThe electric field of an infinitely long charged wireoThe electric field of an infinitely wide charged planeoThe electric field of a charged sphere2Electric Field of a Point Charge E14pe x qr x r where r is a unit 01222vector pointing away from q and e885 x 10 CNm0EFqon qThe net electric field is the vector sum of the electric fields due to each charge and obeys the principle of superpositionElectric field very far away from charged objects appears to be a point charge in the distanceThe Electric Field of Multiple Point ChargesEEiEjEknetnetxnetynetzTo solveoFor each charge determine its distance from P and the angle of E from ithe axesoCalculate the field strength of each charges electric fieldoWrite each vector E in component formioSum the vector components to determine EnetoIf needed determine the magnitude and direction of EnetThe net electric field far from the source charges E xd14pe x net023qx x iElectric Dipole formed by two equal but opposite charges separated by a small distanceoPermanent Electric Dipole oppositely charged particles maintain a small permanent separationoInduced Electric Dipole polarizing a neutral atom with an external electric fieldoDipole Moment p pqs from the negative to the positive charge where s is a small distance and unit of dipole moment is in Cm3Electric Field on the Axis of an Electric Dipole E14pe x 2prwhere dipole0 r is the distance measured from the center of the dipole3Electric Field on Perpendicular Plane rs E14pe x pr only dipole0half the strength of the onaxis field at the same distanceDrawing and Using Electric Field LinesoElectric field lines are continuous curves drawn tangent to the electric field vectorsoThe electric field vector at any point is tangent to the field line at that pointoClosely spaced field lines represent a larger field strength with longer field vectors widely spaced lines indicate a smaller field strengthoElectric field lines never crossoElectric field lines start from positive charges and end on negative chargesThe Electric Field of a Continuous Charge Distribution
More Less
Unlock Document

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.