PHYA22 Chapter 27.doc

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Department
Physics and Astrophysics
Course Code
PHYA22H3
Professor
Brian Wilson

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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
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