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Homework Help: The potential difference and the electric field - please check my answer

  1. Oct 11, 2011 #1
    1. The problem statement, all variables and given/known data

    The potential difference between the ends of a 2 meter stick that is parallel to a uniform electric field is 400V. The magnitude of the electric field is:

    2. Relevant equations

    V = E.d

    3. The attempt at a solution
    E = v/d = 200 v/m
    The right answer
    is 800 v/m, my understanding is U= qV= Fd therefore qV= Eqd and E = V/d so I don't know how they came up with this answer (800v/m)
     
    Last edited: Oct 11, 2011
  2. jcsd
  3. Oct 11, 2011 #2
    Looks right to me.
     
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