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Homework Help: Electric Charge given two forces and distance

  1. Sep 10, 2011 #1
    1. The problem statement, all variables and given/known data

    There are two identical, positively charged conducting spheres fixed in space. The spheres are 38.2 cm apart (center to center) and repel each other with an electrostatic force of F1= 0.0615N. Then, a thin conduction wire connects the spheres, redistributing the charge on each sphere. When the wire is removed the spheres still repel but with a force of F2=0.100N. Using this information, find the initial charge on each sphere, q1 and q2 if initially q1<q2. The Coulomb Force constant is k= 8.99*10^9 N*m^2/C^2

    Hint: Assume the spheres are in a one-dimensional plane to simplify the calculation.

    2. Relevant equations

    Coulombs Law: F=(k*q1*q1)/r^2

    3. The attempt at a solution

    I set up coulombs law equation and solved for q1, then plugged it back into the equation, but all the charges canceled out
  2. jcsd
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