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Homework Help: Electrostatic Forces

  1. Feb 3, 2014 #1
    1. The problem statement, all variables and given/known data
    Two 0.115-gram pith balls are suspended from the same point by threads 22.0 centimeters long. When the balls are given equal charges, the two strings form an angle between them, and the balls come to rest 15.0 centimeters apart. Neglect the mass of the thread.

    What is the tension in each thread?
    What is the magnitude of the charge on each ball?

    2. Relevant equations

    3. The attempt at a solution
    I drew a free body diagram, having the weight straight down, the tension at some angle, and the electrostatic force at some other angle. From this w=T+Fe The only problem is that I am having trouble finding q1 and q2.
  2. jcsd
  3. Feb 3, 2014 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    Welcome to PF;
    What other angle?

    Check the problem statement:
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