1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    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 potential along the x-axis

  1. Nov 30, 2013 #1
    1. The problem statement, all variables and given/known data
    The electric potential along the x-axis is V=100e^(−2x/m), where x is in meters.
    Find Ex at x=1.0m and Ex at x=2.1m


    2. Relevant equations
    V=Ed
    Ex = dV/dx (?)



    3. The attempt at a solution
    I took the derivative of V and got (-200/m)e^(-2x/m)
    I don't know what m is and I'm just not sure how I can get an integer value for Ex at x=1.0m and 2.1m
    EDIT===
    I assumed m=1 and got the correct answer, don't understand what m is though
     
  2. jcsd
  3. Nov 30, 2013 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    m might just represent units of meter. So the 2 in the exponential has units of 1/m and they decided to show that explicitly.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted