# Tagged Questions

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### Integration constants in Maxwell's equations (ambiguousness?)

In classical electrodynamics, if the electric field (or magnetic field, either of the two) is fully known (for simplicity: in a vacuum with $\rho = 0, \vec{j} = 0$), is it possible to unambiguously ...
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### When studying electrodynamics do we assume Maxwell's Equations or derive them?

This question is because something made me confused. I always thought that the idea behind electrodynamics was to postulate some things, like Coulomb's law in electrostatics and so on, and then ...
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Can somebody explain the proof of Gauss's theorem / divergence theorem taking the vector as electric field $$\iiint(\nabla\cdot\vec E)\mbox{ d} V=\iint \vec E \cdot\hat{n} \mbox{ d} ... 1answer 157 views ### Why is there no (time derivative of charge density) in the B field in Jefimenko's equations? I was going through Griffiths chapter on potentials and fields just to brush up on a few old things. He gets to Jefimenko's equations by this general path: Maxwell's equations Introduce scalar and ... 3answers 665 views ### Maxwells Equation from Electromagnetic Lagrangian In Heaviside-Lorentz units the Maxwell's equations are:$$\nabla \cdot \vec{E} = \rho  \nabla \times \vec{B} - \frac{\partial \vec{E}}{\partial t} = \vec{J} \nabla \times \vec{E} + ...
Maxwell's equations specify two vector and two scalar (differential) equations. That implies 8 components in the equations. But between vector fields $\vec{E}=(E_x,E_y,E_z)$ and ...