Recent content by Tekk

I think my approach to find energy assumes there is no resistance on wires. So I suspect that energy would not turn to heat on these wires. What I see during the discharge process is a flow of electrons. Can you explain how electromagnetic radiation is produced?

No, the problem is not appeared in the context of Fourier transformation. It is the problem 31(c) from Chapter 2: Electric Potential of Purcell 2ed E&M textbook. Purcell asks us to describe the charge distribution on the non-conducting flat sheet. I neither see how a charge distribution would...

Homework Statement All charges in space are distributed on the xy-plane. The potential above the plane is known as \phi = \phi_0 exp(-kz) cos(kx) What's the charge distribution on xy-plane? Homework Equations \vec E =- grad(\phi) The Attempt at a Solution Applying the relationship between...

Homework Statement [/B] I have two capacitors: 1-Farad capacitor A, and 9-Farad capacitor B. In state (a), I charged A with 1 Coulomb of charges, as depicted in figure (a). In state (b), I paralleled A with B, by doing this I discharged A, as depicted in figure (b). I try to find the total...

The first article explains why electrons move within zinc-copper interface by introducing energy required for the most energetic electron to escape from a metal (so-called work function). It is said that the most energetic electrons in zinc have more energy than those in copper. And because...

I have a piece of copper in static condition. Since copper is a conductor, within the copper there is no electric field. Strange comes when I bring this copper in contact with a piece of zinc: in a tiny interval of time, certain amount of electrons would flow from copper to zinc. I suspect that...

Your reply is very helpful to me. Thank you!

Hello, mfb Thank you so much for your advice. I found a Ph.D. student job advertisement that I may be interested in, and I plan to study on the project first and then contact the corresponding professor. Is that seemed a good way I could have a taste of the research before I come here? However...

Hello, I have completed a Master program in China, during which, I joined in a project applying nano-particles in optical device. The project motivated me to study optical property of nano-particles, and I am looking for a Ph.D. position in Germany. The problem is: how do I get known with my...