Homework Help: E&M question

1. Apr 18, 2012

Miviato

1. The problem statement, all variables and given/known data
Can you derive Maxwell's equations from conservation of charge, energy and angular momentum for E&M fields?

2. Relevant equations

3. The attempt at a solution

2. Apr 18, 2012

sunjin09

Once you are able to define these quantities, including EM fields themselves, I'm sure you can. But without Maxwell's equations, how do you even define a charge?

3. Apr 18, 2012

Mindscrape

One could argue that the field theory approach, deriving Maxwell's equations from the Lagrangian with 4-vector potentials, is what you've asked about.