Please help! I'm soo confused with surface integrals and have several to do by tues for my tutorial. I don't really understand how to approach surface integrals! Could someone give me an over-view and help me through the question below - hopefully then I can manage the rest myself (Btw $ = integral sign)(adsbygoogle = window.adsbygoogle || []).push({});

Q. Ifnis the unit normal to the surface S, evaluate $$r.ndS over:

a) the unit cube bounded by the coordinate planes and the the planes x=1, y=1 & z=1;

b) the surface of a sphere of radius a centred on the origin.

I *think* that I have to start by finding an equation for the cube (how?!) and then using divergence theorem but I really have no idea what I'm doing (I couldn't follow the lectures and books confuse me with their notation! :uhh:

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Surface Integrals & Vectors

**Physics Forums | Science Articles, Homework Help, Discussion**