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Homework Help: Gr12 charge attraction repulation question

  1. Mar 4, 2013 #1

    I dont understand why the answer is B
    It make sense if the question is asking which one is the incorrect force since my diagram contain all the arrows except B..
  2. jcsd
  3. Mar 4, 2013 #2
    and for this question

    Question:Two charges of +Q are 1 cm apart. If one of the charges is replaced by a charge of –Q, the magnitude of the force between them is
    Ans: the same

    Won't they either get attracted or repelled? then , the magnitude will change isnt it?
  4. Mar 5, 2013 #3
    For the first question, you already know the forces are in directions A, C and D.
    Form the vector sum of forces A and C, then compare it to the size of the force in direction D.

    For the second question, just apply Coulomb's law to the 2 situations to compare the magnitudes of the forces. It doesn't ask anything about the direction.
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