Recent content by Ras9

Hi guys! I am trying to fit a function whose x data depends nonlinearly on the parameter of the fit and I am having hard time doing that! I will explain better: from my experiment I was able to measure my ydata e my x0 array and I know that my xdata are: x=x0+a/(1+4x^2), with a being a...

Yes I know, I have been a little superficial with my definition. Although I don't see any difference between induction and what you called redistribution. Yes you are perfectly right, I thought that the two things might be connected.

Is this somehow connected that the external charge is created by induction from the internal charge?

I think I get it. So basically the field generated from a finite surface single plane is {\sigma \over 2\epsilon_0} only near the plane. If I move to far from it for symmetry reason I can not treat the field vectors as parallel and so the Gauss's law would give a different result (that I...

Hi guys, I was tutoring some students and I was explaining them how to calculate the capacitance between two parallels planes. They made me some questions and actually I am not quite sure about my answers! I started by showing them how to calculate the electric field generated by a single...

I agree with you. I think that when one says that the field is purely transverse is automatic assuming that the distance from the source charge is such that the longitudinal component is negligible (and is can been seen also by the fact that the purely transverse field is derived from putting to...

No particular reason, simply that the spatial variation of the field happens in the z direction since it's confined in the other two.

They assume the case of an hollow cilinder made of a perfect conductor. By expressing the fields as E=E(x,y)e^{i(kz-\omega t)} (same for B) they derive from Maxwells this 6: \partial_x E_y - \partial_y E_x = i\omega B_z \partial_y E_z -ikE_y=i \omega B_x ikE_x - \partial_x E_z = i \omega...

Yes I agree, and this is basically what I showed in the fist part of my post. What is not clear to me is why if there is confinement in transverse direction there is also longitudinal field and how this results from maxwells

Yes I understand this, but why is it so? Is this property contained in Maxwell's equations?

Hi guys, I am having hard times in understanding whether or not the longitudinal electromagnetic waves are solutions to Maxwell's equations. In Cohen-Tannoudji "Introduction to QED" it's stated that by writing the fields as the sum of a longitudinal and transverse part one can show that waves...

I don't know exactly if there is a particular proof for that, I just remember it from my classes. But giving a quick look on wikipedia it seems to be truth: "In simplest terms, if a sine wave is injected into a system at a given frequency, a linear system will respond at that same frequency...

By doing what you are saying I can get the field's correlation function, am I right? And what about the spectral density? If I use a filter in my experiment and I can measure the intensity of the scattered field at different frequencies. So if the change in frequency is negligible i would get...

Hi guys, I was studying dynamic light scattering experiment and I had a problem! Here's the thing: I read that in case of weak coupling between x-rays and matter the whole system behaves as a linear system. I knew that linear systems respond to an input signal with an output that has the same...

Hi everybody! I'm attending a master degree in physics. I've just discovered this community and I think it's amazing. I'm sure I can learn a lot from you guys! (sorry if there're some mistakes with my english, I'll try to improve it :) )