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Homework Help: Magnitude and Direction of Electric Fields

  1. Feb 20, 2013 #1
    Hey yall. This is a question from my homework but it's so basic that it's just to help with the concept for me. So the question is this:

    A small object A, electrically charged, creates an electric field. At a point P located 0.250 directly north of A, the field has a value of 40.0 directed to the south. What is the charge of object A?

    I know there is a formula, is it perhaps E=F/q) E= 2kq/d ? And if it is, what is plugged in for what? Help please!
  2. jcsd
  3. Feb 20, 2013 #2


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    Staff: Mentor

    Tip: a "small object" can be treated as point-like to a good approximation. So try a Google search for "electric field of a point charge".

    If you're using a printed textbook, try looking in the index under "Electric field /
    Point charge" or something like that.​
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