Recent content by teapot

I used a charge density of e/volume (3 e /4 pi R^3) integrated over all space in spherical polars & normalised it then put it in the equation. It basically just got rid of the e But i still get 0 for the 2nd bit! edit: Hooray, i get 1 using 2nd order approximations for sin & cos

ah ok, that makes sense. can't see anything wrong then.

It looks like you've done dAjAj/dri = 2* dAj/dri which i don't think works I'll try see if i can get the same though!

I get thisdH/dri = 1/2m (q^2*dAj^2/dri - 2*q*pj*dAj/dri) + q*dI/dri dH/dpi = 1/2m ( dpj^2/dpi - q*Aj*dpj/dpi)(sorry I am too confused about how to use the latex code!)

oh ok. thanks! maybe that will help. kronecker delta rings a bell I'll have a look through that site too. I got same for dH/dr but with the the + q dI(r,t) / dr on the end

For this thing \frac{\partial p_{j}}{\partial p_{i}} = \delta _{ij} does it mean any component over any different component is equal to the same thing?

I'm in this class and I'm really stuck too. I tried doing the same but i have no idea how to progress from there.