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Hooke's law question

  1. Jul 4, 2010 #1
    1. The problem statement, all variables and given/known data

    A tiny sphere with a charge of q = +8.8 µC is attached to a spring. Two other tiny charged spheres, each with a charge of −4.0-µC, are placed in the positions shown in the figure, in which b = 4.1 cm. The spring stretches 5.0 cm from its previous equilibrium position toward the two spheres. Calculate the spring constant.
    Here is the figure:
    http://www.webassign.net/grr/p16-16alt.gif

    2. Relevant equations


    3. The attempt at a solution

    µΔx=k(Qq)/r
     
  2. jcsd
  3. Jul 4, 2010 #2
    they are saying tiny charges so I guess we can assume gravity does not play a role.

    What force is pulling the charge up and what force is pulling the charge down when it is in equilibrium after stretching?
     
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