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Homework Help: Electric Potential

  1. Jul 16, 2007 #1
    1. The problem statement, all variables and given/known data
    The electric potential in a certain region is
    V = 10x^2 -12x + 63
    Determine the electric field at x = 3m. Answer in units of V/m.
    Determine the position where the electric field is zero. Answer in units of m.

    2. Relevant equations
    E = -(partial derivative V / partial derivative X)

    3. The attempt at a solution
    I took the derivative of V : V' = 20x -12
    E = -20x + 12
    I plugged in 3 for x and found that the electric field is -48 V/m.
    To find the second part of this problem, I used the same equation and set E = 0. I found x to be 0.6 m.

    Is this the right way to work this problem? Thanks.
  2. jcsd
  3. Jul 16, 2007 #2


    User Avatar
    Homework Helper
    Gold Member

    Looks good. Nice Job!
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