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Electric charge and fields: uniform electric field

  1. Jul 7, 2003 #1

    Dx

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    A force of 6N acts on a charge of 3 microC when placed in a uniform electric field. what is the magnitude of the electric field?

    I have
    E = k(Q/r^2... k=9x10^9 * (Q,charge=3x10^-9) / (?)^2

    ths can't be the right formula caus e wheres r^2?
    Dx [?]
     
  2. jcsd
  3. Jul 7, 2003 #2

    Tom Mattson

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    You're right, it is not the correct formula. The formula you quoted is only for an electric field due to a point charge. That's not what you have here; you have a uniform electric field.

    The relationship between force and electric field is F=qE.
     
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