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

The electric field strength 7.79 cm from a very long charged wire is 2660 N/C. What is the electric field strength (in N/C) 12.7 cm from the wire?

2. Relevant equations

E= (9*10^9) Q/ r^2

3. The attempt at a solution

i have energy. so is tried to solve backwards for the first one for Q. Then i plugged in the new Q with relation to 0.127 m. I got 1001 N/C which is wrong. Am I even using the right formula?

**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!

# Homework Help: Electric field strength of a wire comparison

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