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## Homework Statement

A hollow sphere of outer radius R2 and inner radius of R1 carries a uniform charge 2Q. The sphere is then cut in half to create a hemispherical shell of charge Q. Calculate E at the center point (origin) P.

## Homework Equations

equation of a hollow sphere = 2/3π(r2-r1)

Gauss' Law ∫

**E**dot d

**A**

surface area hemisphere = 2πr^2

## The Attempt at a Solution

Well, I know this is an integration problem and that I am better off integrating with polar coordinates and that I will be integrating from 0-->π as my lower and upper integral bounds.

But in all honesty I haven't had much fortune setting the integral up. The set up is the help I am asking for.