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Homework Help: Electric Field/ Coulomb's law.

  1. Mar 11, 2012 #1
    1. The problem statement, all variables and given/known data

    Two point charges of +30μC and -9μC are separated by a distance of 20.0 cm. What is the intensity of electric field E midway between these two charges?

    2. Relevant equations

    force electric= kQq/ r^2
    Electric field= force elctric /q
    = k X Q / r^2
    3. The attempt at a solution

    I tried finding the electric field intensity for both point chrages at 10 cm and tried adding them together but that didn't work..
  2. jcsd
  3. Mar 11, 2012 #2
    Is that really how the problem is worded.
    I don't believe electric fields to have an intensity...

    I would just find the value of the electric fields at the half way distance and add them up. Then the overall field will point toward the negative charge.
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