(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 1.0-mm-diameter wire has 1000 excess electrons per centimeter of length. What is the surface charge density?

2. Relevant equations

[tex]\eta[/tex] = Q/A

3. The attempt at a solution

[tex]\eta[/tex] = (100000 * 1.6*10^-19)/([tex]\pi[/tex] * (5*10^-4)2)

But that gets me 2.037 * 10^-8 C/m^2

The answer is 5.1 * 10^-12 C/m^2

Any ideas?

**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!

# Finding the surface charge density

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