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Homework Help: E&M potential difference

  1. Mar 7, 2016 #1
    1. The problem statement, all variables and given/known data
    The electric field in a region of space has the components Ey = Ez = 0 and Ex = (4.00 N/C·m) x. Point A is on the y axis at y = 3.60 m, and Point B is on thex axis at x = 3.00 m. What is the potential difference VBVA?

    2. Relevant equations
    Vb- Vi = -∫ba E * dS

    3. The attempt at a solution
    The integral should become E*d, or 4*0.6 , but that is incorrect
    The correct answer is -18V
  2. jcsd
  3. Mar 7, 2016 #2


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    Staff: Mentor

    Where does the 0.6 come from? Note that the two points are on different axes.
  4. Mar 8, 2016 #3

    rude man

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    What's a good choice of path integration? Does the datum y = 3.6, as opposed to some other y number, have any significance?
  5. Mar 8, 2016 #4


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    In addition to what the others said, ##\Delta V = Ed## only holds for uniform fields. You don't have a uniform field in this problem.
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