1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electric field strength of a wire comparison

  1. Jan 26, 2010 #1
    1. The problem statement, all variables and given/known data

    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?
  2. jcsd
  3. Jan 26, 2010 #2
    Do you know Gauss's Law?
  4. Jan 26, 2010 #3
    ya is that what i needed to use?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Electric field strength Date
Electric field strength at a point between charges Wednesday at 9:17 PM
Calculating electric field strength Jan 15, 2018