# Homework Help: Surface integral

1. Feb 22, 2010

### gertrudethegr

1. The problem statement, all variables and given/known data

Let S be the boundary of the region {(x,y,z) : 0<z<h , a^(2)<x^(2)+y^(2)<b^2 , and a<b

F is defined at the point with position vector r=(x,y,z) by

F(r)=exp (x^2+y^2)r

Evaluate the surface integral

$$\int$$ F.n dS

Where n is the outward pointing unit normal to the surface S

3. The attempt at a solution

How do i calculate the normal, and what are the limite on the integral?

2. Feb 22, 2010

### ystael

First draw the surface $$S$$; what does it look like?