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Electrical force between two objects

  1. Jul 14, 2014 #1
    I tried to solve the following problem:
    There are 2 objects . The object m1 with charge q and the object m2 with charge q.(same charge).The object m2 is connected with a rope to the ceiling.

    at the initial state , m1 and m2 were on the same height.
    When the object m2 is placed in distance d from the object m1, the following situation occurs:


    Please ignore the force of gravity between the masses and ignore any kind of friction.
    just consider the tension , electrical force and mg.

    You have to find x.

    You can use the parameters k(Coulomb's constant), q , L , d , mg.

    I was able to find only 2 equations that would help to solve the problem but one is still missing.
  2. jcsd
  3. Jul 14, 2014 #2
    2 equations should be enough. The unknowns are x and the tension in the rope.
  4. Jul 14, 2014 #3
    I checked my equations and they are not correct. I wasn't able to calculate the components of the electrical force.
    Could you please write the equations you have found ?

    The equations that I found are :

    1) r ^ 2 = (L-Lcos a) ^ 2 + (x+d) ^ 2
    (r is the distance between the two objects)

    2) sin a = x / L

    3) as you can see ΣFx = 0 and ΣFy = 0 (The object m2),
    but without the components of the electrical force I wansen't able to calculate anything.
    Last edited: Jul 14, 2014
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