Chapter 11: Energy, power flow, and forces

author: Markus Zahn, Center for Future Civic Media, Massachusetts Institute of Technology, MIT
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008,   recorded: September 2005,   views: 4611
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)

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Part 1: 11.6.2: Force on a liquid dielectric (Courtesy of Education Development Center, Inc. Used with permission.) 01:20
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Part 2: 11.7.1: Steady state magnetic levitation 08:11


11.0 Introduction

  • Power flow in a circuit
  • Overview

11.1 Integral and differential conservation statements 11.2 Poynting's theorem

  • Systems composed of perfect conductors and free space

11.3 Ohmic conductors with linear polarization and magnetization

  • An alternative conservation theorem for electroquasistatic systems
  • Poynting power density related to circuit power input
  • Poynting flux and electromagnetic radiation

11.4 Energy storage

  • Energy densities
  • Energy storage in terms of terminal variables

11.5 Electromagnetic dissipation

  • Energy conservation for temporarily periodic systems
  • Induction heating
  • Dielectric heating
  • Hysteresis losses

11.6 Electrical forces on macroscopic media 11.7 Macroscopic magnetic forces

  • Reciprocity conditions
  • Finding the coenergy
  • Evaluation of the force
  • The torque of electrical origin

11.8 Forces on macroscopic electric and magnetic dipoles

  • Force on an electric dipole
  • Force on electric charge derived from energy principle
  • Force on a magnetic charge and magnetic dipole
  • Comparison of Coulomb's force to the force on a magnetic dipole

11.9 Macroscopic force densities

  • The Lorentz force density
  • The Kelvin polarization force density
  • The Kelvin magnetization force density
  • Alternative force densities

11.10 Summary

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