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: [url]http://i.stack.imgur.com/KhKjc.png[/url] 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.