Recent content by Jean-C

Homework Statement The problem statement is simply to find the vector potential inside and outside an infinite wire of radius R, current I and constant current density j using the Poisson equation. Homework Equations The Poisson law can be written A = μ0 /4π *∫(I/r*dl) or A = μ0 /4π *∫(i/r*dV)...

I had a sketch drawn, but redrew it just in case and found out what I was missing! Thanks for your reply!

Homework Statement So the problem is the following : we observe the stellar aberration of a star which isn't on the zenith, so that the star forms an angle theta with the ecliptic plane of the Earth. With such a position, the star will describe an ellipse instead of a circle (typical movement...

Alright, thanks to you I have figured it out! Thanks a lot!

Thanks for the fast answer I really appreciate it! And sorry for the last post, I was very tired... I understand that I need to observe small deviations from equilibrium, but I must be doing something wrong : do I replace xeq by x-xeq and then use the Taylor approximation for the first order...

Homework Statement I got an alpha particle (charge 2+) fixed at x=0 and an electron fixed at x=2. I then add a fluor ion (charge 1-) to the right of the electron and we note his position xeq. The question is to find the constant spring (k) relative to the harmonic oscillation made by the fluor...