Recent content by martiniux

I agree that he should use \vec{J}(r,\vartheta,\varphi)=I \frac{1}{a} \delta(\vartheta'-\pi/2) \delta(r'-a)\vec{e}_{\varphi} where r',\theta',\phi'are spherical coordinates for the current At risk of repeating what some of you guys have already posted, I'll write the procedure I'd usually...

Suposse you have a material you are told is semiconductor, but don't know any more history about the material. What experiment(s) can be performed in order to find out if your material is direct or indirect?