# Confirm that e^2 x coulomb's constant=1

1. Sep 6, 2009

### yungwun22

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

2. Relevant equations

whenever I plug in the correct values I don't get 1. Unless I'm supposed to use au.

3. The attempt at a solution

2. Sep 6, 2009

### Hootenanny

Staff Emeritus
Well what is Coulomb's constant?

Am I correct in assuming that e is the elementary charge?

3. Sep 6, 2009

### yungwun22

it's 1/(4*pi*episolon naught) where episolon naught is 8.85 x 10^-12 F/m. yes, e is the elementary charge.

4. Sep 6, 2009

### Hootenanny

Staff Emeritus
Then there is nothing left to do since as you have now pointed out in your edited opening post, it is clear that

$$e^2 \cdot\kappa \neq 1$$