Vincf's latest activity

I received a warning message about "Unacceptable references or topics." I'm new to this site. Does this mean I have to delete the...

I prefer to pose the question this way: I have a finite charged plane and a point ##M## above the charged plane at a height ##z## much...

We agree. The transition to the infinite limit is not "physical" for the horizontal component of the field. That is to say, with regard...

We've already discussed this, and I don't share the view that it's a boundary value problem. Here, we're dealing with a simple summation...

The Coulomb integral giving the horizontal field does not converge (its value depends on how far the surface is extended to infinity)...

Yes, it works in that direction. What I found more difficult was proving that it's the only possibility regardless of the Lagrangian...

Yes, but since he reasons in general terms, his conclusion should be true without exception? As I told you, Landau's reasoning is...

Landau's goal is to recover the Lagrangian form of a free particle using only translational invariance, spatial isotropy, and the...

Perhaps I'm missing something, but Landau's aim is to show that the Lagrangian is of this form for a free particle. He does this in the...

Upon further reflection, I think that my previous answer is correct except in some particular case. Let us consider the case where : $$...

I am not sure you have correctly understood the notation used by Landau. There is a footnote explaining that $$ \frac{\partial...

The first law of thermodynamics, written in the form ##U_2 - U_1 = W + Q## , only applies to a closed system. That's why we isolate a...

Hello, Indeed, for series that are not absolutely convergent, the problem is well known. And when I was a student, in France, the math...

For the case of a finite plane, which is the most interesting, we could extend the use of Gauss's theorem with a slight modification. We...

Solving the parallel-plate capacitor problem as a boundary value problem is actually very complicated. Take a look at the article I...