2.8. Potential Energy in an External Field - Potential Energy of a Single Charge - Potential Energy of a System of Two Charges in an External Field - Potential Energy of a Dipole in an External Field
2. Electrostatic Potential and Capacitance

2.8. Potential Energy in an External Field - Potential Energy of a Single Charge - Potential Energy of a System of Two Charges in an External Field - Potential Energy of a Dipole in an External Field