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Ranking forces between charged particles

  1. Jan 26, 2013 #1
    1. The problem statement, all variables and given/known data

    Two charges with magnitude (Q) experience a force (F) when held a distance apart. Rank from smallest to largest the forces between charges of the following magnitudes (q), held the following respective distances (r) apart. (There may be ties.)

    A) q= Q/3 r= R/3
    B) q= 2Q r= R/2
    C) q= 2Q r= R
    D) q= 3Q r= 3R
    E) q= Q/2 r= 2R


    2. Relevant equations

    E = K [q1 / d^2]


    3. The attempt at a solution

    I attempted to use E = q1 / d^2 ; inputted values ; for example, for (A): [(Q/3)/(r/3)^2] = 3Q/r^2

    I did not get the sequence correct.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 26, 2013 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Don't compute the E field. Use the Coulomb attraction formula instead.
     
  4. Jan 26, 2013 #3
    Oh good grief of course. Thank you.
     
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