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Homework Help: Potential and Electric Field

  1. Oct 13, 2008 #1


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    1. The problem statement, all variables and given/known data
    Find the potential at a distance z above the center of the charge distributions q and -q, which are distance d apart. Also, compute E= -[tex]\nabla[/tex]V and compare your answer. Suppose that we changed the right-hand charge to -q , what then is the potential at P? What field does that suggest?

    2. Relevant equations
    V = K [tex]\sum q_{}i/r_{}i[/tex]

    3. The attempt at a solution
    I calculated V without changing the right side charge to -q and V came out to be 0 but how do I verify E = -[tex]\nabla[/tex]V since, V is 0, but E won't be 0. I am confused =$.
  2. jcsd
  3. Oct 13, 2008 #2


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    Homework Helper
    Gold Member

    Someone else asked pretty much the same question here
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