Tension and vector question

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data
    In an electricity experiment, a 1.30 g plastic ball is suspended on a 54.0 cm long string and given an electric charge. A charged rod brought near the ball exerts a horizontal electrical force vector F elec on it, causing the ball to swing out to a 21.0 angle and remain there.

    1.) What is the magnitude of vector F?
    2.)What is the tension in the string?

    Any help would be appreciated!

    3. The attempt at a solution
    I honestly have no idea how to start it. A step by step on how to solve it would be nice but any help is appreciated.
  2. jcsd
  3. Sep 13, 2010 #2


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    Draw a picture, put the forces on and resolve.
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