Electric Fields: Point Charges, Parallel Plate Capacitors, and Dipoles - Prof. Kaustubh Ag, Study notes of Physics

Download Electric Fields: Point Charges, Parallel Plate Capacitors, and Dipoles - Prof. Kaustubh Ag and more Study notes Physics in PDF only on Docsity! Lecture 26 • Chapter 26 (The Electric Field) due to configuration of (source) charges (today) parallel plate capacitor (uniform ) motion of (other) charges in Ē Ē Ē • good approx. for small charged object, real wire • Coulomb’s law • due to point charge • limiting cases (check + simpler formula): like point charge very far ( size) Electric Field Models Ē Ē ! K = 14!"0 " ! Electric Field of a Continuous Charge Distribution • even if charge is discrete, consider it continuous, describe how it’s distributed (like density, even if atoms • Strategy (based on of point charge and principle of superposition) divide Q into point-like charges find due to convert sum to integral: Ē !Q !Q !Q ! density "dx (x describes shape of !Q) Electric Field of a Line of Charge • Problem • Strategy • Solution...: Infinite line of charge:Eline = limL!" 14!"0 |Q| r ! r2+(L/2)2 = 14!"0 |Q| rL/2 = 1 4!"0 2|#| r Erod = 14!"0 |Q| r ! r2+(L/2)2