Electric charge and fields: uniform electric field

  1. Dx

    Dx 0

    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. Tom Mattson

    Tom Mattson 5,526
    Staff Emeritus
    Science Advisor
    Gold Member

    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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