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Homework Help: Error for Electric Field Calculation

  1. Feb 12, 2010 #1
    1. The problem statement, all variables and given/known data
    Need to calculate an electric field [tex]\left|E\right|[/tex]. I'm calculating this off of a map of equi-potential lines and electric field lines which have been determined by semiconducting paper.

    I then need to calculate the error -- this is where I am having trouble.

    2. Relevant equations

    [tex]\left|E\right| = \frac{\Delta V}{\Delta l}[/tex]

    [tex]\frac{\delta E}{E}\right)= \sqrt{\left(\frac{\delta V}{V}\right)^2 + \left(\frac{\delta l}{l}\right)^2}[/tex]

    3. The attempt at a solution

    I'm not 100% sure I understand how to use this equation for error. Can anyone offer any assistance?
  2. jcsd
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