# Questions tagged [classical-electrodynamics]

Classical electrodynamics is the discipline that studies electromagnetic phenomena – such as electric and magnetic fields, radiation, and the dynamics of charged bodies – in classical terms.

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### Pulsar distance estimation

This is quite an interesting problem in astrophysics so I thought it would be a good idea to ask here so we can archive the solution for future reference. Consider a pulsar that emits pulses of ...
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### Energy-momentum vs charge-current

Is there a simple intuitive way to explain why energy-momentum density requires a tensor, while charge-current density is a vector? $\partial_{\mu} J^{\mu} = 0$ is a statement, in effect, that the ...
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### Which forces violate Newton's third law of motion? [closed]

Forces arising from magnetic fields do violate Newton's third law of motion under certain circumstances. What other forces violate the third law?
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In Prof. David Tong's notes, specifically on page 10, he gives the Lagrangian of Maxwell's theory to be $$\mathcal{L} = -\frac{1}{2}(\partial_\mu A_\nu)(\partial^\mu A^\nu) + \frac{1}{2}(\partial_\... 1answer 26 views ### Lorentz force within a flux tube I know the formula for the Lorenz force exerted on a point charge q moving with velocity \vec{v} is given by \vec{F} = q\vec{v} \times \vec{B}. Now consider the flux tube with cross section S ... 1answer 44 views ### Changes in boundaries with the application of Faraday's law Reviewing Faraday's law of an induced electric field due to a changing magnetic field$$ \nabla \times E = -\frac{\partial B}{\partial t}$$In integral form via application of Stokes theorem:$$ \...
I found in the following reference (p. 10) an interesting decomposition for the electromagnetic angular momentum in terms of an orbital terms $\vec{L_{orb}}$ and an spin term $\vec{L_{spin}}$. However,...