Understanding why $\frac{\partial (F_{\mu \nu} F^{\mu \nu})}{\partial (\partial_\lambda A_\beta)}=4 F^{\lambda \beta}$ in Maxwell's Equations
63402
Euler-Lagrange equation in curved spacetime: how to calculate $\partial \mathcal{L}/\partial(\nabla_\nu A_\mu)$?
62692
Retrieving Maxwell's equations from the minimum action principle
129394
understanding $\frac{\partial x}{\partial y}\frac{\partial y}{\partial z}\frac{\partial z}{\partial x}=-1$
73829
Coulomb's Law: why is $k = \dfrac{1}{4\pi\epsilon_0}$
115707
Which form of Maxwell's equations is fundamental, in integral form or differential form?
2912
What does it take to understand Maxwell's equations?
71708
Proving that $\left( \frac{\partial^2}{\partial x^2} + \frac{\partial^2}{\partial y^2} \right) \lvert f(z) \rvert^2 = 4 \lvert f'(z) \rvert^2$
155740
Newton's Law of Graviation: Why $G$ and not e.g. $\dfrac{1}{4\pi G_0}$?
29329
Does a four-divergence extra term in a Lagrangian density matter to the field equations?
93539
Why is $M\frac{dv}{dt} = v_{rel} .\frac{dm}{dt}$ correct and $(M - dm)\frac{dv}{dt} = v_{rel} .\frac{dm}{dt}$ wrong?
12924
How to derive Maxwell's equations from the electromagnetic Lagrangian?
88489
Derivation of the polarization identities?
105997
Geometric interpretation of $\frac {\partial^2} {\partial x \partial y} f(x,y)$
27866
Does existence of magnetic monopole break covariant form of Maxwell’s equations for potentials?
6848
The strange thing about the maximum in Planck's law
27296
Derivation of Lagrangian of electromagnetic field from Lorentz force
84291
Do the integral forms of Maxwell's Equations have limited applicability because of retardation?