PHY 2020 Lecture Notes - Lecture 30: Electric Potential Energy, Electric Field, Electric Potential
Document Summary
To learn the electrical potential energy and potential. To learn the basic structure and property of capacitor. To calculate the capacitance of capacitors in series and parallel. To understand how dielectrics are used in capacitators. Both electrical and gravitational forces are conservative forces. Object moving in a uniform gravitational field. Charge moving in a uniform electric field: this is analogous to the gravitation force. Work done on charge q" by the constant electric force between the plate: the electric force has only a y component, so the work it does on the charge is independent of the charge"s path. Positive charge moves in the direction of e: field does positive work on charge, u decreases. Positive charge moves opposite to e: field does negative work on charge, u increases. Example: two large conducting plates separated by 6. 36 mm carry charge of equal magnitude and opposite sign, creating a constant electric field with magnitude 2. 80 x.
