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Homework Help: Magnitude of the electric field

  1. Jan 25, 2010 #1
    1. The problem statement, all variables and given/known data

    Given the distance between 7V equipotential and the 5V at point B is .9cm and the distance between the 3V equipotential and the 5V at point B is 1.0cm, the magnitude of the electric field at point B is _____ V/cm (carry to one decimal)

    2. Relevant equations

    E = |delta V| / delta X

    3. The attempt at a solution

    7V - 5V / .9cm = 2.22 V/cm
    5V - 3V / 1cm = 2 V/cm
    2.22 V/cm + 2 V/cm = 4.22 V/cm

    (7V - 5V) * .9cm = 1.8 V/cm
    (5V - 3V) * 1cm = 2 V/cm
    1.8 V/cm + 2 V/cm = 3.8 V/cm

    Thanks in advanced!
  2. jcsd
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