# Homework Help: Help with understanding part of an integral

1. Sep 28, 2011

### Liquidxlax

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

2. Relevant equations

3. The attempt at a solution

The problem i'm having with this is that I'm not sure how the integral of (1/r)dr from 0 to R is

1/5R

I've had to solve this same problem 3 other ways which i got the end answer all 3 times. This way is just a little weird for me.

NEVER MIND, I was being stupid and forgot that r<R has a different electric field

Last edited: Sep 28, 2011