# Determining the Action of the Electromagnetic Field - Examples

1. Sep 7, 2013

### bolbteppa

In Landau Volume 2 (page 71) an expression for determining the entire electromagnetic Lagrangian is given. What would be an explicit numerical examples of working this idea out along the lines Landau threads, or a good reference for finding these? I can't find anything despite looking in several books,& the whole thing just looks far too general & theoretical to me...

2. Sep 8, 2013

3. Sep 9, 2013

### bolbteppa

Unfortunately it doesn't, no mention is made of how to use the crazy term $\tfrac{1}{16 \pi c} \smallint f_{ik}F^{ik} d \Omega$ in an explicit baby-numerical example, for example, but it is interesting nonetheless.

4. Sep 10, 2013

### UltrafastPED

Your probably looking for that famous book "How to do practical calculations based on your Advanced Theoretical Physics text". Good luck!

5. Sep 11, 2013

### bolbteppa

I can dream...