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Homework Help: 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
    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
    I assumed m=1 and got the correct answer, don't understand what m is though
  2. jcsd
  3. Nov 30, 2013 #2


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    Homework Helper
    Gold Member
    2017 Award

    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.
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