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Homework Help: Coulomb's law

  1. Oct 9, 2005 #1
    A positive charge Q is located at the origin.A small pith ball of mass m and positive charge q is attached to a light string and hangs from a point on the y-axis above the origin.The length of the string is.The teo posotove charges repel,and at equilibrium the pith ball is stationnary with the string making an angle θ to the y-axis, and with the pith ball being a distance L from Q,as shown in the sketch below.
    1-Express the tension in the string T in terms of the electric force F on the pith ball and possibly other quantities
    2-Express the charge q on the pith ball in terms of m,θ,L,Q and possibly other constants.

    p-4.JPG
     
  2. jcsd
  3. Oct 9, 2005 #2

    Pyrrhus

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    Well what have you done?
     
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