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Homework Help: Please help me with electric charges physics problem.

  1. Dec 4, 2012 #1
    Hello, please help me solve this so I can learn from it.


    Two charges with charge +Q are placed at A and C vertices of a rhombus with four even sides (α).
    A prticle with mass m and charge -Q is placed at vertex B.
    An unknown charge size of q is placed at vertex D.
    The sharp angle of the rhombus is 60 degrees.

    What is the size of charge q, that is suffiecient to make the electrical charge affecting the -Q charged particle at vertex B to be 0?

    If charge q is removed, and the particle at vertex B is released from being stationary, while the charges at vertice A and C are still held in place.
    What is the initial acceleration of the released particle?
    What is the velocity of the particle upon reaching the center of the rhombus?

    I have no much of an attempt at solution for I'm am unsure of where to start.

    Thank you very much!
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Dec 4, 2012 #2
    For (1) start by drawing all the force vectors acting on the charge at B and adding them.
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