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Homework Help: Find the Electric Field if Electric Potential is given at two Points . Help needed

  1. Apr 29, 2012 #1
    1. The problem statement, all variables and given/known data
    Given that on the x axis on at -1 the V is 120V at the point +1 V is 80 V . What is the Electric field at the origin (0,0)
    a)must be equal to 20
    b)may be equal to 20
    c)may be greater than 20
    d)may be less than 20

    2. Relevant equations

    3. The attempt at a solution

    I did this V(-1) - V(1) = integral from -1 to 1 (E.dr)
    On Solving
    E = 20 V/cm

    but not sure whats its value at the origin ? According to me it should be less than or equal to 20 but the answer says Greater than or equal to 20 How ?
  2. jcsd
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